Mizunashi kaihin onsen(Hot Spring in the Sea)

Free open-air bath that appears on the seaside only at low tide.



At high tide it sinks into the sea.

Changing room.

Address Esan-misaki, Hakodate-shi
Tel 0138-86-2111
Business hours Bathing time varies according to the tides.
Regular closed day No holiday
Other information
Quality: sodium, chloride fountain
Temperature: 40 ℃ ~ 65 ℃
Outdoor bath: Yes
Efficacy: Neuralgia, muscle pain, coldness etc.

Access From Hakodate Station

90 minutes by car

* Business days and hours are subject to change due to the influence of Novel Cornavirus (COVID-19).

Map of surrounding areas


  • Nishikikyo OnsenNishikikyo Onsen
  • Komagamine Onsen ChappurinkanKomagamine Onsen Chappurinkan It is a unique day-sized hot spring. The first in eyes is the Hokkaido Komagatake, watching from a large outdoor bath.
  • Kojohama OnsenKojohama Onsen 100% natural hot spring without any filtration or additives is really pleasant and likes to be able to spend time quietly and slowly.
  • Toyoura Shiosai OnsenToyoura Shiosai Onsen 100% natural hot spring without any filtration or additives.
  • Yakumo Onsen(Oboko Hot Spring)Yakumo Onsen(Oboko Hot Spring) It is a hot spring featuring an outdoor bath that changes color to ocher color when iron is touched by air.
  • Spring water of Mt. YoteiSpring water of Mt. Yotei There are several spring water in Mt. Yotei (Niseko town, Kutchan cho, Kyogoku-cho, Makkari-mura).
  • Mt. EsanMt. Esan An active volcano designated by Esan Prefectural Natural Park.
  • Goryokaku TowerGoryokaku Tower 107 meters tall, the recommended season of the cherry tree is early May.
  • Mt. HakodateMt. Hakodate One of world's three biggest night views. The contrast of the light of the city area and the darkness of the sea on both sides is beautiful.
  • Koryu-ji TempleKoryu-ji Temple The oldest temple in Hakodate (曹洞宗 (Caodong school)).