Karasugasen, Mountain at Tottori Prefecture, Japan.

Karasugasen is a 1,448-meter lava dome in the Daisen volcanic group, on the border of Tottori Prefecture's Kotoura and Kofu towns. Its pyramidal profile, likened to a crow with spread wings, earns it the name 'San'in Matterhorn'. Formed about 20,000 years ago alongside Daisen's Misen and Sanko peaks, it rises south of the main Daisen peak.

Karasugasen is a lava dome of the newer Daisen volcano, formed about 20,000 years ago together with Misen and Sankoho, and its eruption produced a large pyroclastic flow. The summit area collapsed after the 2000 western Tottori earthquake, and climbing was banned from August 2001 until the ban was lifted on 30 July 2016. The ban was reimposed after the 21 October 2016 central Tottori earthquake further damaged the trail.

The name Karasugasen comes from the mountain's shape, which from a distance resembles a crow spreading its wings. A local legend tells that the mountain once competed in height with Daisen and, having lost, was kicked in the head by the angry Daisen, leaving its summit truncated.

The trailhead is at Kagamigaike on the southern foot of the mountain. The route has collapsed sections and requires care at chained rock passages. Climbing has been banned again since the October 21, 2016 Tottori Chubu earthquake, which caused further collapse of the trail.

The name comes from the mountain's shape: seen from afar, it resembles a crow with wings spread. Its pyramidal profile earned it the nickname "San'in Matterhorn". A legend says it lost its summit in a fight with Daisen, which kicked its head off after losing a height contest.