St Mary's Isle (also known as Conister Rocks or the Tower of Refuge) is part of a reef on the Isle of Man.
Conister is a corruption of the Manx Kione y skeyr meaning the 'head of the reef'.
It is a partially submerged rock at the tip of a reef in Douglas Bay. This reef is mostly obscured now by development into the sea, using the reef as a foundation.
Conister itself is fully submerged at exceptional spring high tides, and can be accessed very briefly on foot at the corresponding low tides.
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