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Miyahama Onsen

Mihara, Hiroshima, Japan
Miyahama Onsen
Location
Mihara, Hiroshima, Japan
Water type
sodium chloride
Temperature
41 °C
pH
7.3

Water profile

Thermicity
Sedative
41 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Restorative
LowHigh

Loaded with major ions — the essential minerals (Ca, Mg).

Buoyancy
Effortless float
LowHigh

Dense, salty water — you float without effort.

SodiumChloruresBrome

Miyahama Onsen is a hot spring resort in Aki City, Kochi Prefecture on Shikoku Island, more precisely in the coastal zone of Hiroshima Prefecture's Aki area near the Seto Inland Sea, whose iodine-bearing mineral waters provide relaxing bathing within a long thermal tradition to the coastal community of this scenic Hiroshima Prefecture location. Hiroshima Prefecture, whose name is associated internationally with the devastating atomic bombing of August 1945, has rebuilt itself as one of Japan's most visited prefectures, home to the Hiroshima Peace Memorial Park and Museum, the floating torii gate of the Itsukushima Shrine on Miyajima Island designated as a UNESCO World Heritage Site, and the Saijo sake brewing district. The iodine-rich mineral waters of Miyahama Onsen provide a coastal hot spring experience within the broader cultural and scenic heritage of Hiroshima Prefecture, whose Seto Inland Sea location, island landscapes, and legacy of peace and reconstruction make it one of the most historically and humanly significant destinations in Japan.

Insider tip — Miyahama Onsen is tucked into the coastline of Hiroshima Prefecture, where iodine-enriched seawater percolates through the earth to emerge as a concentrated saline thermal spring. The dense brine retains heat superbly and promotes healthy circulation, a boon during the mild but damp Seto Inland Sea winters. Views from the outdoor baths extend across calm coastal waters studded with small islands. Fresh oysters harvested from nearby Hiroshima Bay make this one of Japan's finest foodie onsen destinations.
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).