It has an area of approximately 0.17 hectares and belongs to the municipality of Blowatz.

The flat bodden island is approximately 55 metres long and wide.

Its shape resembles a U lying on its side because of an indentation in the northwest.

Grot Deil was used as pasture until the mid-1970s, and has since become a habitat for breeding birds.

A homogeneously developed sea aster reedbed grows on the island with drifts of sea club-rush (Bolboschoenus maritimus), tall fescue (Festuca arundinacea) and greater sea-spurrey (Spergularia media) as well as the species on the Red List of Mecklenburg-Western Pomerania such as English scurvygrass (Cochlearia anglica), saltmarsh sedge (Festuca salina), sea aster (Aster tripolium) and sea wormwood (Artemisia maritima).