Forty-five minutes on the Ariake Ferry from Kumamoto, and you are on the Shimabara Peninsula — a volcanic landscape where steam erupts from the earth, koi swim through castle-town streets, and Japan’s longest foot bath stretches 105 meters along the coast. The Nagasaki side of the Ariake Sea puts a volcano field, a castle town and a seaside hot spring town within one day’s drive of each other. I am Nobutoshi from Hidden Japan Gems. When I visited in March 2026, I found that driving off the ferry at Taira Port makes a full-day loop easy to plan. Below are the stops, drive times, opening hours and where to eat on the Nagasaki side.
Table of Contents
Quick Facts
| Detail | Info |
| Base port | Taira Port (多比良港), Unzen City, Nagasaki Prefecture |
| Ferry connection | Nagasu Port (Kumamoto) — about 45 min, ¥500/adult, ¥1,800–2,900 for most cars (by length, driver included; longer vehicles more); car bookings close the day before |
| Top attraction | Unzen Jigoku — volcanic hell with free admission |
| Castle town | Shimabara Castle + Samurai Quarter + Koi Streets — about 25 min from port |
| Onsen | Obama Onsen — hot spring town on Tachibana Bay with a 105 m foot bath (free) — about 45–50 min |
| Food | Obama champon, Shimabara guzoni, kanzarashi dessert |
| Best for | Nature, history, onsen, photography, couples, food lovers |
| Recommended duration | Half a day for one area; a full day (about 9 hours port to port) for all three |
1. What Makes Unzen Jigoku (Volcanic Hell) Worth Visiting?
Unzen Jigoku is the main sight of the Shimabara Peninsula: a free, 30-minute walk through near-boiling steam and sulfur-stained rock. About 35–40 minutes by car from Taira Port, the mountain road climbs to a geothermal field with more than 30 named jigoku (steam vents and hot pools). For the full walk-through, see our Unzen Jigoku & Kojigoku guide.
The boardwalk path winds through the geothermal field. The ground beneath is white and grey — bleached by centuries of sulfuric acid. Rocks are stained yellow. On cold mornings, the steam is so thick you cannot see the person 10 meters ahead of you.
The full loop takes 30–45 minutes on a well-maintained wooden boardwalk. Signs along the way explain the geology and the history. During the persecution of Christians between 1627 and 1632, Unzen’s boiling pools were used for torture. Thirty-odd Christians were killed here. The site carries a weight that goes beyond geology.
What to do at Unzen Jigoku:
•Walk the full boardwalk loop (30–45 min).
•Try onsen tamago — eggs slow-boiled in hot spring water. ¥200 for 2 eggs at Unzen Jigoku Kobo, the small stand near the trail’s end. It sells from 10:00 to 16:00 or until sold out, and may close in bad weather.
•Soak your feet in one of the free foot baths in the Unzen Onsen town.
•Visit Unzen Oyama no Johokan (the visitor center) for exhibits on the volcano. It is free, open 9:00–17:00 and closed on Thursdays.
| Detail | Info |
| Distance from Taira Port | About 35–40 min by car |
| Admission | Free |
| Parking | No car park of its own; paid lots nearby (Oyama no Johokan parking is free for its visitors) |
| Duration | 30–60 minutes for the jigoku |
Book Unzen & Shimabara area tours on Viator
2. How to Drive the Shimabara Peninsula Route
The drive from Taira Port climbs from sea level to about 700 meters at Unzen Onsen through volcanic terrain. You will pass deep valleys carved by ancient eruptions, dense cedar forest, and sudden views of the Ariake Sea far below.
Two routes to consider:
Route A: Taira → Unzen (direct)
About 35–40 minutes, climbing through mountain switchbacks. The views open up as you gain height.
Route B: Shimabara Mayuyama Road (島原まゆやまロード)
If you drive from Unzen toward Shimabara, this 8-kilometer road passes between Mt. Mayuyama and Heisei-Shinzan — the lava dome that grew during the 1990–95 eruption of Mt. Unzen. The Heisei-Shinzan viewpoint (Heisei-Shinzan Tenbo Enchi) along the road looks straight at the dome.
This photo shows the volcanic silhouette you will recognize from the ferry deck. On the Nagasaki side, you are driving on that silhouette. For more details on renting a car and navigating, check our guide on How to Use Japan’s Highway System with a Rental Car.
3. What to See at Shimabara Castle & Samurai Quarter
About 25 minutes by car from Taira Port, Shimabara Castle was built from 1618 to about 1624. The five-tier white keep you see today is a 1964 reconstruction with a museum covering the Shimabara Rebellion, and a quiet, preserved samurai quarter is nearby. The keep rises above stone walls and moats with irises in spring and lotus in summer.
The castle museum inside covers the Shimabara Rebellion (1637–38), where persecuted Christians and overtaxed farmers united against the Tokugawa shogunate. The exhibits include Christian artifacts hidden during centuries of persecution. The top-floor observation deck offers 360-degree views of the Ariake Sea and Mt. Unzen.
A 10-minute walk from the castle brings you to the Buke Yashiki (武家屋敷) — a preserved samurai residential quarter. This gravel road of about 400 meters runs between moss-covered stone walls with a spring-fed stream. Three former samurai houses are open to visitors, displaying the modest daily life of lower-ranking warriors. It is free and quiet, and open 9:00–17:00 all year.
| Detail | Info |
| Distance from Taira Port | About 25 min by car |
| Castle hours | 9:00–17:30 (last entry 17:00), open every day |
| Castle admission | Adults ¥700 / elementary to high school students ¥350 (university students pay the adult rate). Castle parking ¥500 per car |
| Samurai quarter | Free, 9:00–17:00, open all year |
Book Shimabara area activities on Klook
4. Where to Find Shimabara’s Swimming Koi Streets
In the Shinmachi area near Shimabara Castle, a stone channel carries clear spring water where dozens of colorful koi swim freely. Shimabara sits on volcanic springs, and fresh water wells up all over the city.
The water is so clear you can see every pebble on the bottom. The surrounding streets include several small shops where you can try kanzarashi (かんざらし) — Shimabara’s signature dessert of small shiratama (rice-flour) dumplings in a chilled syrup. Prices vary by shop.
5. How to Experience Obama Onsen & Hot Foot 105
Obama Onsen features Japan’s longest foot bath — a free 105-meter facility right on the seafront, about 45–50 minutes by car from Taira Port. The hot spring source here reaches 105°C, which is why the town named its signature attraction Hot Foot 105.
The foot bath has multiple sections:
•Standard sitting bath — the 105°C source water is cooled before it reaches the bath.
•Walking bath — a shallow section with natural stones that massage your feet.
•Pet section — a separate area where dogs can soak.
•Steam cooking station — self-service steam baskets (¥200 for 30 minutes) for vegetables, seafood or eggs you buy in town.
Hours: 10:00–19:00 April–October and 10:00–18:00 November–March (steam baskets stop 30 minutes earlier). Closed on the third Wednesday of the month, January 4–5 and in bad weather. The town car park is ¥250. Obama faces west over Tachibana Bay, so the foot bath looks toward the sunset.
Find Obama Onsen & Unzen area hotels on Booking.com
6. Where to Watch the Sunset Over Tachibana Bay
Obama faces west over Tachibana Bay, not the Ariake Sea, so the Obama Onsen seafront is the side of the peninsula for sunsets. Sunset in Obama is around 5:15 PM in December, about 5:50 PM in mid-October and close to 7:30 PM in June. Check the time for your date.
Specific spots include:
•Hot Foot 105 seafront — soak your feet while watching the sunset.
•Obama Onsen beachfront — the beach between the foot bath and town.
•Unzen mountain roads — stop at a signed viewpoint with parking for a view from higher up.
7. What to Eat on the Shimabara Peninsula
The Shimabara Peninsula offers unique local dishes like Obama champon (noodle soup), Shimabara guzoni (mochi soup), and kanzarashi (dumplings in syrup).
| Dish | What it is | Where | Price |
| Obama champon | Obama’s take on Nagasaki champon: lighter chicken-and-pork broth, thick noodles, often shell-on shrimp and egg (varies by shop) | Obama Onsen town (about 10 shops) | Varies by shop |
| Shimabara guzoni | Mochi soup with a dozen-plus ingredients (round mochi, kamaboko, vegetables, chicken, grilled conger eel, egg) | Near Shimabara Castle | Varies by shop |
| Kanzarashi | Shiratama dumplings in a chilled syrup | Koi streets area | Varies by shop |
| Onsen tamago | Eggs boiled in Unzen Jigoku hot spring water | Unzen Jigoku trail end | ¥200 (2 eggs) |
| Steam-cooked seafood | Vegetables, seafood or eggs steamed in self-service baskets | Hot Foot 105 station | ¥200 per basket for 30 min, plus the food |
Nobu pick: Obama champon first, kanzarashi for dessert later in Shimabara, onsen tamago as a snack at Unzen. If you have dietary restrictions, convenience stores (Lawson, 7-Eleven) along the coastal route offer simple vegetarian options, though halal-certified restaurants are rare in this specific rural area.
8. Suggested Full-Day Itinerary from Taira Port
This route takes a full day (about 9 hours port to port) and covers Shimabara Castle, Unzen Jigoku, and Obama Onsen in one loop from Taira Port. Ferry times are from the Ariake Ferry’s normal timetable: hourly from 6:00 AM to 8:00 PM, the same times from both ports.
| Time | Activity | Duration |
| 8:00 AM | Ferry from Nagasu Port (arrives at Taira Port about 8:45) | 45 min |
| 9:00 AM | Drive to Shimabara | About 25 min |
| 9:30 AM | Shimabara Castle (opens 9:00) + Samurai Quarter + Koi Streets | 2 hours |
| 11:30 AM | Kanzarashi break in Shimabara | 30 min |
| 12:00 PM | Drive to Unzen via Mayuyama Road | About 30–40 min |
| 12:45 PM | Unzen Jigoku walk + onsen tamago (egg stand open 10:00–16:00) | 45 min |
| 1:30 PM | Drive to Obama Onsen | About 20 min |
| 2:00 PM | Obama champon lunch (check the shop’s last order; some close mid-afternoon) | 45 min |
| 2:45 PM | Hot Foot 105 + steam baskets | About 1 hour 45 min |
| 4:30 PM | Leave Obama and drive back to Taira Port | About 45–50 min |
| 6:00 PM | Ferry to Nagasu Port (car boarding starts 10 minutes before departure; cars without a booking board after booked cars) | 45 min |
Leave Obama around 4:30 PM — it is roughly 45–50 minutes back to Taira Port, and car boarding for the 6:00 PM sailing starts at 5:50 PM (cars without a booking board after booked cars, so leave some margin). From about October to March you can stay for the sunset in Obama and take the 7:00 PM or 8:00 PM (last) ferry instead. In April and September the sun sets around 6:30–7:00 PM, so the 8:00 PM (last) ferry is still possible but tight; from May to mid-August it sets after 7:00 PM (close to 7:30 PM in June), too late for the last ferry, so stay the night in Obama if you want it.
Car bookings for the ferry are taken up to the day before; same-day bookings are not accepted, and cars without a booking board after booked cars. Fares are paid in cash at the port; cards and e-money are not accepted. There are no bookings for the first (6:00 AM) sailing or during peak periods.
If you are coming from the other side, read our guide on Day Trips from Nagasu Port: Kumamoto Side.
9. Where to Stay Near the Nagasaki Side
Unzen Onsen offers mountain ryokans with volcanic baths, while Obama Onsen provides seaside relaxation and sunset views.
| Area | Style | Best for | Drive from Taira |
| Unzen Onsen | Mountain ryokan with volcanic onsen | Nature, hiking, couples | About 35–40 min |
| Obama Onsen | Seaside ryokan with sunset views | Seafood, relaxation, sunset | About 45–50 min |
| Shimabara City | Budget hotels near castle | Sightseeing, budget | About 25 min |
Unzen Onsen is my first choice for a night: the inns sit around the jigoku field you walked through, and the hot spring water comes from the same volcanic system.
Search Unzen/Shimabara hotels on Agoda | Search on Booking.com | Compare flights to Nagasaki Airport on Trip.com
10. Practical Tips for Southeast Asian Travelers & More
•Flights & Access: Travelers from Singapore, Bangkok, and Kuala Lumpur may find direct flights to Fukuoka Airport (FUK), including on low-cost carriers; routes change, so check current schedules. From Fukuoka, you can drive down to Kumamoto and take the Ariake Ferry across to Taira Port. Check our Japan Airport & Flight Guide 2026 for details.
•Weather & Clothing: In December, Unzen’s mountain elevation means temperatures average 5°C (41°F) — significantly colder than the 26°C (79°F) in Singapore or Jakarta. Bring proper winter jackets and layer your clothing.
•Cash vs. Card: While urban areas in Southeast Asia are highly cashless, many small shops, parking lots, and kanzarashi cafes on the Shimabara Peninsula are cash-only. Bring ¥5,000–10,000 in small bills.
•Onsen Etiquette: At Obama Onsen and Unzen, remember to wash your body completely before entering the bath, and never let your towel touch the water.
•Winter Detour: In winter (roughly November to March) the Konagai Oyster Huts in Isahaya City are a detour north of Taira Port, toward Saga — not on the way to Obama. Opening dates change each season, so check before going.
11. FAQ
What is the best thing to do on the Nagasaki side of the Ariake Ferry?
Unzen Jigoku (volcanic hell) is the top attraction. It is free, about 35–40 minutes by car from Taira Port, and the boardwalk takes 30–45 minutes. Combine it with Obama Onsen’s free 105-meter foot bath for a volcanic hot spring experience.
Can I visit Shimabara, Unzen, and Obama Onsen in one day from Taira Port?
Yes, but it takes a full day, about 9 hours port to port. Shimabara Castle is about 25 minutes from Taira Port, Unzen Onsen about 35–40 minutes, and Obama Onsen about 45–50 minutes (the ferry company’s own estimates). To catch the 6:00 PM ferry, aim to leave Obama around 4:30 PM.
Is the drive from Taira Port to Unzen difficult?
The road has steep switchbacks but is well-maintained with guardrails. It is comfortable for experienced drivers. Take it slowly in rain or fog.
Can I visit the Nagasaki side without a car?
You can visit partially without a car, but a rental car is strongly recommended. Taira Station on the Shimabara Railway is about a 9-minute walk from the port, and a Shimatetsu bus stop is about 140 m away, but buses to Unzen and Obama are infrequent.
What is Obama champon?
Obama champon is Obama’s own take on Nagasaki champon — a lighter chicken-and-pork broth with thick noodles, often topped with shell-on shrimp and sometimes an egg. Around ten places in town serve it, and each makes it differently.
Is Unzen Jigoku safe to visit?
Yes, Unzen Jigoku is safe. The boardwalk is well-maintained and kept at a safe distance from hot vents. Stay on the marked path, as the ground near active vents can be unstable and the water is near boiling.
What is the best season for the Shimabara Peninsula?
Autumn (October–November) is a good time for the autumn leaves around Unzen. In winter the steam at Jigoku is thicker on cold mornings, and the Konagai oyster huts in Isahaya, a detour north of Taira Port, open for the season (dates change each year).
How does the Nagasaki side connect to a broader Kyushu itinerary?
From Shimabara, you can continue to Nagasaki City in about 1.5 hours by car. This makes the Ariake Ferry a convenient one-way bridge: Kumamoto → ferry → Shimabara/Unzen → Nagasaki City.
On the Nagasaki side of the Ariake Sea, the 1990–95 eruption of Mt. Unzen is recent history: you can see its lava dome from the Mayuyama Road.
The same volcanic system feeds the hot springs at Unzen and Obama, where the 105-meter foot bath faces west over Tachibana Bay at sunset. Spring water also runs through Shimabara’s streets in the channels where the koi swim.
All of it is a 45-minute ferry ride from Kumamoto.
Sources checked
ariake-ferry.com, discover-nagasaki.com, shimabarajou.com, shimabaraonsen.com, unzen.org, shimakanren.com, nagasaki-tabinet.com, japan-guide.com
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