Nakanoshima

碧き島の宿 熊野別邸 中の島へききしまのやど くまのべってい なかのしま

Lodging
Kansai·Wakayama

Bathing & Water

OnsenYes

Uses natural hot spring water

中の島温泉4,5,6,7号の混合泉

Nakanoshima Onsen Wells No. 4, 5, 6, 7 (Blended Source)

Operated by · 株式会社中の島

Mixed source

Sampled at mixing tank
Chloride
Classification

Sodium Chloride spring

A blended source drawing from Nakanoshima wells No. 4, 5, 6, and 7, emerging at a hot 52.5 C. The chemistry is sodium chloride water at 8,612 mg/kg dissolved solids — isotonic, weakly alkaline, and decisively salty on the lips. A faint rotten-egg note of hydrogen sulfide drifts off the source, and the heat-retaining mineral coating clings to the skin well after the bath.

pH
7.60
Weakly alkaline
Source temperature
52.5°C
Hot
Tonicity
8.61g/kg
Isotonic
Flow rate
367L/min
Typical
Free CO₂
9.20mg/kg
Low
Free H₂S
1.40mg/kg
Typical
Color
colorless and transparent
Taste
salty
Odor
hydrogen sulfide
Highlights
  • Top-decile hot

Analyzed May 8, 2019·一般社団法人 和歌山県薬剤師会 検査センター

Views

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SM
Sergey M
4 months ago

658. Nakanoshima, Nachikatsuura, Wakayama (pt.4) ★★★ Onsen: 3. Private bath Misaki No Yu. 3.1. Outdoor bath. There's a fence, but tolerable. View of the bay, mountains, and buildings. Clear water, slight sulfurous smell. Temperature 42.5. 3.2. Indoor bath. Clear water, slight sulfurous smell. Temperature 42.5. Breathing inside is comfortable, and you can open the door to outside if needed. 06.11.2025 07.11.2025

SM
Sergey M
4 months ago

658. Nakanoshima, Nachikatsuura, Wakayama (pt.3) ★★★ Onsen: 2. Main bath zone, available on the second day for men: 2.1. Outdoor baths. Amazing view of the bay and the opposite shore. 2.1.1. Stone bath on the lower level. Clear water, proper sulfurous onsen smell. Temperature 36. 2.1.2. Stone bath on the main level. Clear water, proper sulfurous onsen smell. Temperature 41.5-43, varies by location. 2.1.3. Cave bath on the main level, adjoining the open-air bath. Clear water, proper sulfurous onsen smell. Temperature 42-43, varies by location. 2.1.4. Stone bath on the upper level with three reclining spots. Small fence, doesn't significantly spoil the view. Clear water, proper sulfurous onsen smell. Temperature 41.5. 2.2. Indoor bath with clear water, temperature 41. Breathing inside is comfortable. Bath photo from the internet matches. 06.11.2025 07.11.2025

SM
Sergey M
4 months ago

658. Nakanoshima, Nachikatsuura, Wakayama (pt.2) ★★★ Onsen: 1. Smaller bath zone, available on the first day for men: 1.1. Outdoor stone bath with an amazing view of the bay and the opposite shore. Clear blue-green water with white mineral deposits. Proper sulfurous onsen smell. Temperature 40-42, varies by location. 1.2. Indoor bath with clear water, temperature 41.5-42. Breathing inside is comfortable. 06.11.2025 07.11.2025

SM
Sergey M
4 months ago

658. Nakanoshima, Nachikatsuura, Wakayama (pt.1) ★★★ A modern powerful ryokan on its own small island. Stayed overnight. No day use. Accessible only by ferry from the Katsuura port pier. You need to first visit the office just before the pier, located in a small building next to the Nachikatsuura Port Post Office. There they do the pre-registration and give you ferry tickets to the island and a return ticket for the next morning to spread out guest arrivals. The place is in excellent condition, high service level, lots of Japanese staff. The tatami room is very pleasant with a small balcony and water view. There's a separate walking/viewing area with an even more scenic surrounding view. Got food for one — at dinner they served kaiseki in a separate hall — it was delicious, and the meat was especially good. There's a gender swap in the morning plus two private onsen baths at 3300 yen each (I booked one). Top-tier place in terms of service, onsen, and atmosphere. Worth a dedicated trip for an overnight stay, and it combines perfectly with a day use visit to Hotel Urashima for a powerful onsen experience in the area. 06.11.2025 07.11.2025