Mt. Santo (1,009 m) is the second highest mountain in the Teshio mountains, which stretch from north to south in the eastern part of Hokkaido. Although it is not a very high mountain, it is not easy to climb this mountain. The vertical interval of the whole trail is about 800 meters and there are a lot of ups and downs in the trail along the ridge. The name “Santo (Three Heads)” derives from the three peaks respectively named Itto (the 1st Head), Nito (the 2nd Head) and Santo (the 3rd Head). It is counted as one of 100 Fine Mountains in Hokkaido.

Mt. Santo is known for the abundant growth of alpine plants. It is said that all the flowers that bloom in Hokkaido in spring can be seen in this mountain. The plants include Ezo-engosaku (Corydalis ambigua), dogtooth violet, Hakusanchidori (Orchis aristata) and the rare species of Odorikoso (Lamium album var. barbatum) and Ezonohanashinobu (Polemonium yezoense).

The bushes of Chishimazasa (Sasa kurilensis), which cover the trail along the ridge, are sheared off neatly at the summit, where you can get a pleasant relief after conquering difficulties. You can command a panoramic view of the Sea of Japan and the Taisetsu mountains in the distance. If you lie down on the green carpet, you will see nothing but the unlimited expanse of sky.