Koshinetsu and its high mountains
Koshinetsu lies in central Honshu and consists of three prefectures: Yamanashi, Nagano, and Niigata.
High mountains extend across Yamanashi and Nagano, while Niigata faces the Sea of Japan. Some areas receive heavy winter snowfall, and each prefecture has a different landscape.
Explore Koshinetsu on the map and look for hot springs with me.
Explore the hot springs of Koshinetsu on the map
Select a ♨ marker to see information such as the hot spring or source name, recorded area, temperature at the time of investigation, pH, and sampling date.
You can also search by hot spring name, source name, or municipality using text, or use the microphone button to search by voice.
Look not only in the mountains but also near the Sea of Japan. You may find a hot spring record close to a place you know or somewhere you would like to visit.
About the map data
The ♨ markers represent historical records included in AIST’s Hot Spring Chemical Analysis Data. They are not a list of hot spring facilities currently in operation, and the dates of investigation vary by location.
A place without a marker does not necessarily have no hot springs. Each marker shows an approximate location and does not indicate the exact site of a spring or the entrance to a facility.
The displayed temperature was measured at the source and may differ from the temperature of the water in a bathing pool. The pH value is only a guide to acidity or alkalinity. Temperature and pH alone cannot determine a hot spring’s type or therapeutic effects.
How many hot springs are there in Koshinetsu?
According to the Ministry of the Environment, Koshinetsu has 357 hot spring areas and 1,795 hot spring sources. Together, they discharge 206,690 liters of water per minute.
The number of hot spring areas and the number of sources are not the same. A single hot spring area may contain multiple sources.
The data card lets you compare Koshinetsu’s number of hot spring areas, total number of sources, and discharge volume with the figures for Japan as a whole.
For a region with so much mountainous terrain, does the number of sources seem high or low to you?
What I noticed while making the map
On the Koshinetsu map, hot spring markers appear among the mountains.
Because this is such a mountainous region, I had expected the number of sources to be even higher.
As you zoom in, you may find records not only for famous hot springs but also for places whose names you have never encountered before.
Why not explore the map to find a hot spring in Koshinetsu that you would like to visit?
Japan / Kanto / Chubu and Hokuriku
Sources: Ministry of the Environment, Hot Spring Use in Fiscal 2024 (data as of March 31, 2025); Geological Survey of Japan, AIST, Geothermal Resources of Japan: Hot Spring Chemical Analysis Data (published in 2020)
The data card uses Ministry of the Environment statistics, while the ♨ markers use AIST’s historical analysis records. The scope, reference date, and counting method differ, so the figures are not expected to match. Before visiting, check the facility’s or local government’s official information for its current location and operating status.