Ynys Benlas is a small islet situated in the Inland Sea between Anglesey and Holy Island. It measures approximately 65 metres (east-west) by 35 metres (north-south) at low tide and covers about 0.2 hectares.
Its name translates from the Welsh for "blue top island", which is thought to derive from the fact that bluebells apparently flourished on it.
According to the Archaeological Journal (1844), the islet (referred to as Ben Las in the Journal), may have been an ancient signal hill.
This islet is not to be confused with Ynys Benlas in the Menai Strait near Church Island, nor with Ynys-las near RAF Valley.
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