Thursday, December 25, 2025

Tenjin Island

Tenjin Island is an island located in the Sajima area of Yokosuka City, Kanagawa Prefecture.  It is situated near the entrance of Otawa Bay, which is part of Sagami Bay.

Located on the west coast of the Miura Peninsula at the entrance of Otawa Bay, it is a small island with a circumference of about 1 kilometer.  The Tenmangu Shrine on the island attracted the faith of local residents, making it difficult for human interference, so rich nature remains from the coastline to the central part of the island.

In 1953 (Showa 28), the Hama-yu (Hamaomoto) lily plant, found on Tenjin Island was designated a natural monument of Kanagawa Prefecture as the northern limit of its natural distribution.  Furthermore, in 1965 (Showa 40), part of Tenjin Island and Kasashima, along with the surrounding waters, were designated as a scenic spot and natural monument, and since the following year, the Tenjin Island Marine Nature Education Museum has been managing it.

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Tenjinjima Coastal Nature Education Park is located on the west coast of the Miura Peninsula, facing Sagami Bay.  The park, blessed with a natural environment, is home to many coastal plants and animals and is one of the few natural coastlines remaining on the Miura Peninsula.  Tenjinjima, Kasajima, and the surrounding sea area (about 54 hectares) are designated as a natural monument of Kanagawa Prefecture because they mark the northern limit of the distribution of Hamaomoto (Hama-yu), a southern beach lily plant.





















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