6 Recommended Sightseeing Spots in Shimabara Onsen – Enjoy Sightseeing in the Hot Spring Town of the City of Water

Shimabara Onsen, boasting an abundant supply of hot spring water, is located on the Shimabara Peninsula in the southern part of Nagasaki Prefecture. The city of Shimabara, situated on the eastern side of the peninsula, is known as the “City of Water,” and the sight of hot springs gushing out from various spots around the city is truly impressive. The Shimabara Peninsula is also home to one of the world’s most famous active volcanoes, Mount Unzen, which is registered as a UNESCO Global Geopark. Here, we have carefully selected recommended spots around Shimabara Onsen where you can enjoy both sightseeing and relaxation.

1. Shimabara Castle

Standing at the foot of Mount Unzen and overlooking the Ariake Sea, Shimabara Castle was built in 1624 by the feudal lord Shigemasa Matsukura, who lived from the Sengoku period into the early Edo period. Inside the castle, exhibits include materials and photographs related to Christianity, the Shimabara Rebellion, and Amakusa Shirō. For those interested in the history of Shimabara, this is a must-see. And of course, one of the pleasures of visiting a castle is enjoying the view from the tenshukaku (main keep), where you can take in the entire Shimabara area.
As one of Japan’s Top 100 Castles, Shimabara Castle is illuminated at night mainly on weekends and public holidays. The sight of this historic structure glowing against the night sky is magical. There is also a special plan where one group per day can stay overnight in a camping trailer at the base of the illuminated castle — a rare experience that is well worth booking early if you’re interested.

2. Shimabara Spring Group (Town of Swimming Carp)

Known as the “City of Water,” Shimabara City produces an astonishing 220,000 tons of spring water every day. The “Shimabara Spring Group” refers to over 60 spring sites across the city, which have been selected among the “100 Best Waters of Japan.” In the Shimmachi district, there is a 100-meter waterway where colorful carp swim in the crystal-clear spring water — a refreshing and soothing sight. As one of the city’s most popular attractions, it’s well worth a stroll.

3. Reikyu Shrine

Reikyu Shrine is located within Reikyu Park, in the heart of Shimabara City. The park is home to about 250 Somei Yoshino cherry trees, making it a famous cherry blossom spot. The shrine is said to have been established after the Shimabara Rebellion, when part of the spirit of Tokugawa Ieyasu was transferred (enshrined) here from Nikkō Tōshō-gū. It is believed to grant blessings such as “peace of the realm,” “regional safety,” “community prosperity,” and “business success.” The powerful statue of a fierce dog on the grounds is also worth seeing.

4. Shimabara Hibariyama Park

Shimabara Hibariyama Park is a great hidden gem for sightseeing. Its name comes from the role of watching over volcanic activity. In spring, the park is covered with blooming moss phlox, and in autumn, vibrant fields of cosmos flowers take over. Seasonal events are held during these peak bloom periods. From here, you can also enjoy panoramic views of Heisei Shinzan. It’s the perfect place for a leisurely stroll while enjoying the natural beauty of the Shimabara Peninsula. Do note that the park is closed on rainy days.

5. Unzen Jigoku (Unzen Hell)

Unzen Jigoku is one of Shimabara’s most iconic sightseeing spots. The air is thick with the smell of sulfur, and steam rising from the ground creates a white, otherworldly scene reminiscent of hell itself. In fact, there are about 30 separate “hells” scattered throughout the area. A walking path allows visitors to enjoy a tour of these geothermal wonders in about 30 minutes.
One of the specialties here is eggs steamed in the hot spring steam, known as onsen tamago. A local saying goes, “Eat one and live five years longer, eat two and live ten years longer, eat three and live until you die.” At the Daikyōkan Jigoku on the eastern side, you can still witness active steam venting — a dramatic sight that draws many visitors. Hot spring lovers will also enjoy visiting nearby Unzen Onsen.

6. Unzen Ropeway

The Unzen Ropeway offers direct access to the summit of Mount Unzen, the symbol of the Shimabara Peninsula. The departure point, Nita Pass, also has an observation deck with a stunning view, but the three-minute ropeway ride to the summit offers an even more spectacular panorama. From spring to early summer, the mountaintop is blanketed with vibrant pink azaleas.
Even in summer, the summit’s average temperature is around 21°C, providing a cool and refreshing escape. In autumn, the entire mountain is transformed into a vivid canvas of reds and oranges — an awe-inspiring scene best viewed from late October to early November. A ride on the Unzen Ropeway is a must for anyone visiting the area.

◎ Final Recommendation: Where to Stay in Shimabara Onsen

One particularly recommended inn in Shimabara Onsen is Nampurō. All rooms offer ocean views, where guests can enjoy breathtaking sunrises over the Ariake Sea. Relax in the open-air baths fed directly from the source while gazing out over the sea. Indulge in meals made with the rich natural bounty of the Shimabara Peninsula for a truly luxurious experience. In addition, Shimabara Onsen has many facilities offering drop-in bathing, making it a perfect place to enjoy a hot spring-hopping adventure.

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