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FUTAGOJIMASO - Kishu Onsen Hot Spring & Saikanoyu Hot Bath

紀州温泉 雑賀の湯 双子島荘

Lodging
Kansai·Wakayama
+81 73-444-1145futagojimasou.com

Day Use

Yes

Bathing & Water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

OnsenYes

Uses natural hot spring water

龍門山温泉

Ryumonzan Onsen

Operated by · 有限会社 青山産業

Sampled at wellhead
塩
Chloride
Classification

Sodium-Calcium Chloride spring

A sodium-calcium chloride spring sourced at 25.1 °C and reheated for bathing. Weakly alkaline (pH 7.6 at the wellhead), it carries a salty edge with a faint mineral note on the tongue. Total dissolved solids of 4.4 g/kg place it firmly in the moderately mineralized band — the kind of chloride water that leaves lingering warmth after you climb out.

pH
7.60
Weakly alkaline
Source temperature
25.1°C
Low temp.
Tonicity
4.38g/kg
Hypotonic
Flow rate
270L/min
Typical
Free CO₂
22mg/kg
Low
Color
colorless and transparent
Taste
faintly mineral, faintly salty
Odor
odorless

Analyzed Sep 2, 2019·一般社団法人 和歌山県薬剤師会 医薬品・公衆衛生検査センター·Cert no. 第E1908189号

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SM
Sergey M
3 months ago

690. Futagojimaso, Wakayama (pt.2) ★★ Onsen details: Small outdoor bath with a view of the bay and the other shore, but through a glass fence. If you wet the glass, you can see through it fairly well. Clear water, temperature around 41. Indoor bath. View through the window to the ocean and the other shore. Clear water, temperature around 41.5. Breathing inside is comfortable. 11.11.2025 12.11.2025

SM
Sergey M
3 months ago

690. Futagojimaso, Wakayama (pt.1) ★★ Stayed overnight, didn't order food. Higaeri onsen for 1200 is available from 11:00 to 15:00. They also offer higaeri meal + onsen packages. A very atmospheric Showa-era concrete ryokan. The atmosphere captivates you immediately inside. A local ginger cat roams freely around the ryokan, and a black cat can be seen outside. Views from the windows of the ocean, abandoned buildings, and old fishing structures. There's an observation deck on the roof with a view of the ocean and Bandoko Garden, which is very nearby. If you walk toward the town and stroll around the area for 20-30 minutes, the Showa atmosphere only gets stronger - lots of abandoned buildings and Showa-era stuff. For fans of Showa vibes, this place is highly recommended. For others, it's a chance to experience Showa atmosphere in a very balanced format between quality and decrepitude. 11.11.2025 12.11.2025