 For this reason the island is known in Welsh as "Ynys Amlwch", Amlwch Island.The islet is tiny (a maximum 141 metres long by 61 metres wide) with a maximum area of only , and void of any significant flora and fauna.The islet is one of three similarly named islands off the north coast of Anglesey, the other two being West Mouse (Maen y Bugail) and Middle Mouse (Ynys Badrig).