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Shionoe Onsen: Kagawa's tranquil retreat with ties to Kobo Daishi

Published May 9, 2026·3min read

Located in the southern mountains of Takamatsu City, Kagawa, Shionoe Onsen is affectionately known as "Takamatsu's inner parlor." This historic hot spring village, said to have been founded by the great monk Kobo Daishi 1,300 years ago, offers a peaceful escape surrounded by lush nature.

Table of Contents
  1. Overview
  2. Representative Spring Quality and Indications
  3. Water Characteristics and Best Season
  4. Access
  5. Nearby Sightseeing & Local Gourmet

Overview

The history of Shionoe Onsen is ancient. It is said to have been discovered by the Buddhist priest Gyoki in the Nara period, and later, during the early Heian period, Kobo Daishi (Kukai) visited and spread knowledge of its therapeutic effects. Due to its profound history, it is the only hot spring in Kagawa Prefecture designated as a "National Hot Spring Health Resort."

In the Edo period, it flourished as a private spa for the Matsudaira clan, the lords of the Takamatsu domain. Its quiet, mountain-ringed setting is perfect for refreshing oneself away from the hustle and bustle of the city, and it retains a strong atmosphere of a traditional therapeutic spa town loved by many.

Representative Spring Quality and Indications

Radon

The main spring type at Shionoe Onsen is a "Radioactive spring" containing radon. The water is clear, colorless, and odorless, with low irritation, making it suitable for everyone. It is said to warm the body from the core and is expected to enhance the immune system and natural healing powers.

  • Hyperuricemia (gout)
  • Rheumatoid arthritis
  • Ankylosing spondylitis
  • Peripheral circulatory disturbance
  • Sensitivity to cold

Water Characteristics and Best Season

As the source temperature is relatively low, most facilities heat the water. However, the spring is characterized by its abundant flow and soft, pleasant feel on the skin. It is also well-suited for long-term stays for therapeutic purposes (toji).

The ability to enjoy the scenery of all four seasons is another of Shionoe Onsen's charms. You can appreciate different atmospheres throughout the year: cherry blossoms in spring, fireflies in early summer, river activities in summer, autumn foliage, and snowy landscapes in winter. Spring, with its fresh greenery, and autumn, when the mountains are ablaze with color, are particularly recommended.

Access

Kansai Airport (KIX)Travel timeabout 3 h 30 min
RouteAirport Limousine Bus to Takamatsu Sta. → Kotoden Bus (Shionoe Line) from Takamatsu Sta. (approx. 60 min).
Fukuoka Airport (FUK)Travel timeabout 4 h
RouteSubway to Hakata Sta. → Shinkansen to Okayama Sta. → JR Seto-Ohashi/Yosan Line to Takamatsu Sta. → Kotoden Bus (Shionoe Line) from Takamatsu Sta. (approx. 60 min).
Tokyo StationTravel timeabout 5 h
RouteShinkansen to Okayama Sta. → JR Seto-Ohashi/Yosan Line to Takamatsu Sta. → Kotoden Bus (Shionoe Line) from Takamatsu Sta. (approx. 60 min). The Japan Rail Pass covers the train portion.
Shin-Osaka StationTravel timeabout 2 h 30 min
RouteShinkansen to Okayama Sta. → JR Seto-Ohashi/Yosan Line to Takamatsu Sta. → Kotoden Bus (Shionoe Line) from Takamatsu Sta. (approx. 60 min).

Facilities with Analysis Reports

No facilities with registered analysis reports in this area yet.

Facilities Without Analysis Reports

Candidate facilities in this area are automatically added from OpenStreetMap.

Nearby Sightseeing & Local Gourmet

  • Sanuki Udon: The signature dish of Kagawa Prefecture. Famous udon shops are scattered around the onsen area.
  • Pheasant (Kiji) Cuisine: A local specialty of the Shionoe area, served in hot pots or as sashimi.
  • Honetsukidori: A spicy chicken-on-the-bone dish originating from the nearby city of Marugame.
  • Shionoe Museum of Art: Enjoy art appreciation in a tranquil, nature-surrounded setting.
  • Mt. Ohtaki: Features a beautiful primeval beech forest, ideal for hiking.
  • Hotaru no Sato Park (Firefly Village): Witness a magical dance of fireflies around June.
  • Naiba Dam: A beautiful dam lake known as a famous spot for autumn colors.
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References