Mount Tenjō (Kōzu-shima Island) 天上山
The 572-metre lava cone formed in the eruption of 29 July 838, and today its flat summit ridge holds three lakes, including a heart-shaped one sacred to local fishermen.
Mount Tenjō (天上山, 571.8/572 m) is the volcano and the highest point of Kōzu-shima Island, in the municipality of the same name in Tokyo prefecture; it is not to be confused with the Mount Tenjō of the same name near Lake Kawaguchi, in Yamanashi. According to the Wikipedia infobox it formed in an eruption that began on 29 July 838 (year 5 of the Jōwa era), which produced pyroclastic flows and surges and finally a lava dome. The official municipal website describes it as ‘台形状’ (trapezoidal in shape), recognisable from the sea although, as an island mountain, it has ‘深山幽谷の趣’ (the atmosphere of a deep valley). The summit is a relatively flat surface with three lakes (Baba, Fudō, Sendai) and two sandy stretches called the ‘front desert’ and the ‘rear desert’.
Tokyo
白島登山口入口, 黒島登山口入口
