Lake Tazawa, Volcanic crater lake in Semboku, Japan.
Lake Tazawa is a crater lake in Semboku that covers 25.9 square kilometers in northern Akita Prefecture. Sapphire-blue water reflects the surrounding mountain forests, creating a natural frame of wooded hills along the shoreline.
Geological surveys in 1909 confirmed the water reaches a depth of 423 meters, making it the deepest lake in Japan. These measurements also explained why the water temperature remains constant throughout the year.
The Goza-no-ishi Shrine sits along the northern shore with a vermillion torii gate rising from the water, tying the lake to spiritual practices of the region. Visitors come here to admire the view and observe local customs carried out around this quiet waterside site.
Buses from JR Tazawako Station bring visitors to several access points along the 20-kilometer shoreline. The paths around the shore are suitable for walking, and in summer you can swim or rent pedal boats.
The water temperature stays constant because of the depth, so the surface never freezes in winter. Even on cold days the water rests quietly under the snow, offering a rare sight for visitors in this mountain region.
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