The island has appeared on maps since at least 1791 when it featured on Milne 's map of the area .
The island is an area of raised ground approximately 180 metres by 80 metres amid the tidal sands between the channels of Sweare Deep and Emsworth Channel .
The area has appeared on maps since at least 1791 when island featured on Milne 's map of the area .
The island is an area of raised ground approximately 180 metres by 80 metres amid the tidal sands between the channels of Sweare Deep and Emsworth Channel .