The lake Kawaguchi, one of the five big lakes surrounding Mt. Fuji recently, dried up recently.
And the Rokkaku-do, a hexagonal wooden pagoda looking building, on a island in the lake, built as a commemoration of the old temple built by a student of a famous monk, Nichiren, is only reachable by boats usually. But you can walk to it simply because these days with much less water.
Some says it is a sign of next earthquake or Mt. Fuji eruption, some says it is not. The experts are cautious saying it is not unsual and citing the year 1997 when the water level was even 1 meter lower than today. Also the water level was low like today in 2007, 2008 and 2009 ( Jcast news).
Let us hope nothing happens!
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