Though Mount Haku, the main peak in the Ryōhaku Mountains, was created by an active stratovolcano, Mount Bessan is made up of sedimentary rock. On the southern face of the mountain is a rock wall called the Taihei Wall (太平壁 Taihei-kabe). Near the peak of the mountain is the tree line made up of Siberian Dwarf Pines. In the beginning of summer, alpine plants like anemones. A wider variety of plants can be seen at lower levels, but the surrounding area is part of Japan's snow country, so it is covered by snow for more than half of the year.