is a mountain in Tsubetsu,

Hokkaidō is Japan's second largest island and comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu; the two islands are connected by the undersea railway Seikan Tunnel. The la ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. It is the source of the

Abashiri River is a river in Hokkaidō, Japan. History Around 1000 years ago, the Okhotsk culture settled the river basin and moved inland. Remains from the Jōmon period have been found on the bottom of Lake Abashiri. Course The Abashiri River rises in Tsube ...

. The mountain is made up of non-alkaline

mafic A mafic mineral or rock is a silicate mineral or igneous rock rich in magnesium and iron. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include ...

volcanic rock 7 million to 1.7 million years old. N₃(102) per legend; located just northwest of Mt. Oakan (1370m). Map shows 978m elevation.

References

Ahoro {{Hokkaido-geo-stub