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Unazuki Onsen: Gateway to Kurobe Gorge, a Spring for Beautiful Skin

Published May 9, 2026·3min read

Unazuki Onsen, Toyama's largest hot spring resort, is nestled in the magnificent nature of the Kurobe Gorge. Known as the starting point for the Torokko Train, its clear, gentle alkaline simple spring is beloved as "bihada-no-yu" (water for beautiful skin).

Onsen in Unazuki Onsen - Tougen Kurobe Unazukionsen
Tougen Kurobe Unazukionsen
Onsen in Unazuki Onsen - Unazukionsen SanyanagiteiOnsen in Unazuki Onsen - Unazuki Onsen Yamanoha
Table of Contents
  1. Overview
  2. Prominent Spring Quality and Indications
  3. Water Characteristics and Best Season
  4. Access
  5. Nearby Sightseeing & Local Gourmet

ANALYSIS REPORTS IN THIS AREA

See the onsen of Unazuki Onsen

Onsen analysis reports visualized by minerals, pH, temperature, and a 5-axis profile. Swipe to see other facilities.

Toyama ・ 黒部市

Tougen Kurobe Unazukionsen

Unazuki Onsen Gensen
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単
SPRING TYPE
Simple Spring

Spring water that is gentle on the skin with a very low likelihood of irritation. Safe for bathing infants and those with sensitive skin.

See features & indications▾
Bathing indications
Autonomic instabilityInsomniaDepression
Definition :Total dissolved solids (excluding gases) below 1,000 mg/kg; water temperature 25°C or above.
Source: 環境省「あんしん・あんぜんな温泉利用のいろは」（監修：日本温泉気候物理医学会） ↗Read full article
CHARACTER
Pristine Piped Gorge Spring

Flowing from the Kuronagi Onsen located upstream along the Kurobe River, the Unazuki Onsen Gensen was successfully piped to the town in 1923 through a grueling seven-kilometer wooden pipe construction. Today, the 98.3°C naturally gushing waters are widely distributed to the town's inns and public baths, deeply tied to the region's pioneering history.

AI GENERATED
pH
8.2Mildly Alkaline
0 acidic14 alkaline
TEMP
98.3℃
Very Hot Spring
5 AXIS
1234StimulationBactericidalSkin BeautyHeat RetentionRelaxation

Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.

KEY MINERALS
Fluoride ionColumn
6.2 mg/kg

A trace antibacterial component that keeps skin clean.

Metaboric acidColumn
4.4 mg/kg

A trace component with gentle antibacterial and anti-inflammatory action.

Metasilicic acidColumn
26.9 mg/kg

A natural moisturizer that leaves a hydrated feel on the skin.

Bicarbonate ionColumn
132 mg/kg

Softens dead skin cells for a silky bathing feel.

Sodium ionColumn
99.8 mg/kg

Gentle warming effect that helps you stay warm after bathing.

Overview

Unazuki Onsen, which opened in 1923, is a premier hot spring destination in Toyama Prefecture. Its source water is piped from Kuronagi Onsen, located about 7 kilometers upstream along the Kurobe River. The pipeline, constructed along the steep cliffs of the gorge, is a testament to the challenging engineering of its time.

Situated at the entrance to the Kurobe Gorge, one of Japan's most famous V-shaped valleys, many ryokans and hotels line the gorge, offering breathtaking seasonal views from guest rooms and open-air baths. The Kurobe Gorge Railway's Torokko Train is a major attraction, and Unazuki Onsen thrives as its departure point.

Prominent Spring Quality and Indications

Simple

The water at Unazuki Onsen is a weak alkaline simple spring with a pH of over 8. It is colorless, odorless, and gentle on the skin, making it suitable for everyone from children to the elderly. It is known as "bihada-no-yu" (water for beautiful skin) for its expected effect of softening and removing old skin cells.

  • Sensitivity to cold
  • Poor circulation
  • Dry skin
  • Decreased gastrointestinal function

Water Characteristics and Best Season

The source temperature is extremely high, over 90°C (194°F), with an abundant flow. The water temperature is adjusted before being distributed to the various inns. The clear, transparent water is said to be among the most transparent in Japan.

Unazuki Onsen can be enjoyed year-round, but the autumn season (late October to mid-November) is particularly spectacular, offering exceptional views of the fall foliage from the Torokko Train. In winter, enjoying the snowy landscape from an outdoor bath is a magical experience.

Access

Haneda Airport (HND)Travel timeabout 3 h 30 min
RouteTake Keikyu Line/JR to Tokyo Sta. → Take Hokuriku Shinkansen to Kurobe-Unazukionsen Sta. → Transfer to Toyama Chiho Railway. The Japan Rail Pass can be a cost-effective option.
Narita Airport (NRT)Travel timeabout 4 h
RouteTake Narita Express/JR to Tokyo Sta. → Take Hokuriku Shinkansen to Kurobe-Unazukionsen Sta. → Transfer to Toyama Chiho Railway. The Japan Rail Pass is recommended.
Tokyo StationTravel timeabout 3 h
RouteTake the Hokuriku Shinkansen 'Hakutaka' to Kurobe-Unazukionsen Sta. → Transfer to Toyama Chiho Railway from Shin-Kurobe Sta. to Unazuki Onsen Sta.
Shin-Osaka StationTravel timeabout 3 h 30 min
RouteTake the Ltd. Exp. 'Thunderbird' to Tsuruga Sta. → Transfer to Hokuriku Shinkansen to Kurobe-Unazukionsen Sta. → Transfer to Toyama Chiho Railway.

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Nearby Sightseeing & Local Gourmet

  • Kurobe Gorge Railway (Torokko Train): A popular scenic train ride from Unazuki to Keyakidaira Station.
  • Unazuki Dam: A beautiful dam with an emerald-green lake and a spectacular view from its observatory.
  • Yamabiko Bridge: A red iron bridge crossed by the Torokko Train, a popular photo spot.
  • Selene Museum of Art: An art museum featuring works themed around the Kurobe region.
  • Omokage Statue: A bronze statue in the onsen town that tells the story of the hot spring's discovery.
  • Shiro Ebi (White Shrimp): Known as the 'jewel of Toyama Bay,' with a delicate, sweet flavor.
  • Hotaru Ika (Firefly Squid): A mystical delicacy from Toyama Bay, in season during spring.
  • Kan-Buri (Winter Yellowtail): A representative fish of Toyama, at its most delicious and fatty in winter.
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