Mount Poroshiri, Mountain summit in Hidaka Subprefecture, Japan

Mount Poroshiri rises to 2,052 meters in the Hidaka mountain range on Hokkaido and provides hiking trails that follow stream courses throughout. The route crosses rivers multiple times and passes through varied terrain as it ascends the slope.

The name comes from the Ainu language and means Big Mountain, reflecting the peak's importance in the Hidaka chain. This naming shows the historical connection between the summit and the region's indigenous people.

The Ainu of the Biratori area, including the Nibutani district, revered the mountain as a kamuy, a deity, because its distant profile served as a landmark. The name Poroshiri comes from Ainu poro-shiri, "great mountain". The peak is one of Fukada Kyūya's 100 Famous Mountains of Japan.

Hikers should prepare for a round trip of about 23 kilometers and bring waterproof footwear to safely cross the rivers on the route. The best time to hike is between July and September, when conditions are most reliable for the journey.

The summit holds a second-order triangulation point named "Poroshiri". The upper slopes contain cirques formed during Quaternary glacial periods; the Nanatsu-numa Cirque was chosen in 2007 as one of Japan's 100 geological sites. Pikas and black woodpeckers live on the mountain.