Mount Tenmon

Mount Tenmon (天門山 Tenmon-san; also known as Mount of the Celestial Gate) is the highest mountain in Surea. Along with Mount Senryon (仙靈山 Senryon-san) and Mount Soutai (雪台山 Soutaizan), it is one of Japan's "Three Secret Mountains" (三聖山 Sanseizan). Mount Tenmon and surrounding moutains belong to Josanada Alps, which is part of Josanada National Park in Surea. The highest point of the range, Mount Tenmon, is 3,893 metres (12,772 ft) above sea level. Mount Tenmon was once in the ocean and raised to the current height when the Eurasian Plate slid under the neighboring Philippine Sea Plate.

An active volcano that last erupted in 1807–08, Mount Tenmon straddles the boundary of Fuzusaki, Chiwon and Takajima prefectures, northwest of Konggei, from which it can be seen on a clear day. It is located near the Pacific coast of central Honpura. Three cities surround it: Fusugu (south), Yamako (east) and Zakahata (west). Mount Tenmon's exceptionally symmetrical cone is a well-known symbol of Surea and it is frequently depicted in art and photographs, as well as visited by sightseers and climbers.

Mount Tenmon is one of the favorites among Surean mountain climbers. It also attracts climbers from all over the world. Due to humid ocean climate surrounding the island of Surea, Mount Tenmon is often surrounded by clouds. So, it is famous for the forever-changing cloud formations around the mountain.