| Mount Poroshiri | |
| Elevation M: | 2052.8 |
| Elevation Ref: | [1] |
| Translation: | big mountain |
| Map: | Japan |
| Label Position: | right |
| Coordinates: | 42.7194°N 142.6828°W |
| Topo: | 25000:1 幌尻岳 50000:1 夕張岳 |
or sometimes Mount Horoshiri is located in the Hidaka Mountains, Hokkaidō, Japan. Its name was derived from a phonetic kanji transcription of the Ainu words for "great mountain", poro-shiri.[2] It is the highest mountain in the Hidaka range, and is one of the 100 famous mountains in Japan.[3]
The course is a two-day course.
On the first day, drive 35 km from to the . From the gate it is a 5 km (2 hours) hike to the on the . From the dam it is another 4 km (3 hours) to the . The cottage is maintained by the Biratori Alpine Club and sits 950 m above sea level.
For the second day, the route climbs 1.5 km (2 hours) from the mountain cottage to the . The route continues another 2.5 km (2 hours) along the field of alpine flowers past the to the summit. The route then turns north and runs 3 km (2 hours) along the to the summit of Mount Tottabetsu (1959m). From there it is a 1 km (30 minute) walk to Mount Naka Tottabetsu. The route then descends 3 km (2 hours) to the Mount Poroshiri Mountain Cottage.[4]
The Niikappu River course starts at . From there the trail proceeds to, which forms Lake Poroshiri. From the dam the trail goes to a survey cabin along the Poroshiri River and then onto the mountain ridge before ascending to the summit.[5]