The colour
Emerald and blue.
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Okama is a crater lake in the Zao mountain range in Miyagi Prefecture, near the border with Yamagata in northern Japan, about 6 km from Zao Onsen in a straight line, and it is seen as the symbol of the Zao mountains. It is also called Goshiki-numa, the «five-colour pond», because its water shifts between emerald and blue with the light and the weather. A horseshoe crater wall and a central volcanic cone surround it like a cooking pot, which gives the lake its name, and its water temperature sometimes rises with volcanic activity. The lake lies in the highest part of the range near Katta-dake, 1,758 metres high, ringed by bare rocky slopes in browns, greys and reds, with low shrubs turning colour in autumn. About 300,000 people visit each year. The viewpoint is reached by a seasonal mountain road that usually closes in winter because of snow. The weather changes fast and fog can hide the lake, so pick a clear day and bring warm clothes.
Emerald and blue.
Horseshoe shaped.
Coloured shrubs.
Zao Mountains, on the Miyagi and Yamagata border, Japan
June to October.
No, it usually closes.