Great Cob Island

Great Cob island is a small island in the estuary of the River Blackwater in Essex, England, the United Kingdom. The island is an area of low-lying salt marsh in the tidal channel known as Virley Channel that runs to the east of the village of Tollesbury. Long and narrow in shape, it is around 900 m in length and around 100 m at its widest. It lies just to the south of the RSPB nature reserve of Old Hall Marshes.