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.

AddressEsan-misaki, Hakodate-shi
Business hoursBathing time varies according to the tides.
Regular closed dayNo 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

Map of surrounding areas


  • Nishikikyo OnsenNishikikyo Onsen
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  • 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.
  • Tirolnoyu OnsenTirolnoyu Onsen The smallest city in Japan Utisai. Old coal mine town. Population 3,500 people.
  • Wakoto OnsenWakoto Onsen Let's get in after checking the condition of hot water.
  • Kawayu OnsenKawayu Onsen The hot water overflowing from the hot spring of flows as a river flowing through the hot spring town.
  • Takeyama-kogen OnsenTakeyama-kogen Onsen The Onsen is popular. Guests can enjoy accommodation, meals, and day-trip hot springs. This place is a well-kept secret
  • Kotan OnsenKotan Onsen It is the only place where you can feel an outdoor bath with swans of Kussharo-ko lake.
  • Kitami Takinoyu OnsenKitami Takinoyu Onsen 100% natural hot spring colorless transparent weakly alkaline hot spring.