Ynys Castell
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Ynys Castell (SH564727) is a small island in the Menai Strait which separates Anglesey from mainland Great Britain.
The island is an extruding piece of Precambrian schist lying to one side of the Afon Cadnant estuary. It lies between Ynys y Bîg and Ynys Gaint. There is a causeway running to the island that is covered at high tide. On the island there is a private house.
Ynys Castell is Welsh for "Castle Island".