Mount Asahi, Mountain summit in Nasu, Japan.

Mount Asahi is a volcanic peak in the Nasu mountain group reaching approximately 1,900 meters (6,200 feet) with varied geological features across its slopes. Multiple established hiking routes crisscross the mountain, offering different paths and viewpoints for visitors.

Mount Asahi is a stratovolcano of andesite that erupted roughly 200,000 to 100,000 years ago, growing inside the horseshoe-shaped caldera left by the collapse of the Sanbon'yari volcano. It stands about 1.8 km south-southwest of the still-active Chausu volcano. Kyūya Fukada, in his 1964 book Nihon Hyakumeizan, recorded that the rocky rise of the summit is said to be a remnant of a crater wall.

The name Asahi-dake ("morning sun peak") appears in Fukada Kyuya's 1964 book Nihon Hyakumeizan, in the entry on the Nasu mountains, where he notes that the rocky rise of the summit is said to be a remnant of a crater wall. The mountain is one of the peaks of the Nasu range, which the same book counts among Japan's hundred famous mountains.

Access the peak by following established hiking trails from the base, wearing sturdy footwear and protective clothing for the ascent. Weather changes rapidly at elevation and visibility can shift suddenly, so prepare accordingly before starting your hike.

The summit is not the highest of the Nasu peaks but the sharpest; the rock mass crowning it is said to be the remnant of a crater wall, as Fukada Kyuya noted in his book on the hundred mountains. The summit and trail carry few trees, so the view opens in every direction.