Mount Zaō


The Zaō Mountains, commonly called Mount Zaō, are a group of complex volcanoes on the border between Yamagata Prefecture and Miyagi Prefecture in Japan. They consist of a cluster of stratovolcanoes and are the most active volcanoes in northern Honshu. The central volcano of the group includes several lava domes and a tuff cone, Goshiki-dake, which contains a crater lake named "Okama". Also known as the "Five Color Pond" because it changes color depending on the weather, it lies in a crater formed by a volcanic eruption in the 1720s. The lake is in diameter and deep, and is one of the main tourist attractions in the area.
One striking feature of Zaō's famous ski resorts is the "snow monsters" that appear in mid-winter. Strong wind over the nearby lake fling water droplets which freeze against the trees and their branches, until near-horizontal icicles begin to form. Falling snow settles on the ice formations, and the end result is a grotesque figure of a tree. The effect of a full forest of such trees gives visitors a ghostly impression. Zaō is one of the 100 famous mountains in Japan.
Rotaria rotatoria and Pinnularia spp. are found in the acidic Okama Lake.