Kōzuke Island, Lake island in Nikko, Japan
Kōzuke Island is a small, uninhabited island sitting in the middle of Lake Chūzenji, a mountain lake in the Nikko region of Japan. It rises just above the water surface and is entirely surrounded by the lake, with no connection to the shore.
Lake Chūzenji was formed when lava from Mount Nantai blocked a valley and trapped water over many centuries ago. Kōzuke Island emerged as part of that same volcanic landscape and has remained unchanged since.
Kōzuke Island is visible from the shore and stands out as a natural reference point on the open water of Lake Chūzenji. For those taking a boat ride on the lake, it often becomes a quiet focal point during the crossing.
The island is best seen from a boat trip on Lake Chūzenji, which allows you to get close to it from the water. Landing on the island is not possible, so the boat itself is the only way to observe it nearby.
The name Kōzuke refers to an old Japanese province located far from this lake, which raises questions about how that connection came to be. This makes the island a small geographic puzzle sitting quietly in the middle of the water.
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