Gretagrund

Gretagrund (or "Greta-Grund") is a shoal located a few km southeast of Ruhnu island in the Gulf of Riga, Estonia.
Protected area.
Since 12 August 2010 the water area was taken under protection as being a habitat for the following migratory birds: Black-throated loon ("Gavia arctica"), little gull ("Larus minutus"), red-throated loon ("Gavia stellata"), long-tailed duck ("Clangula hyemalis"), velvet scoter ("Melanitta fusca") and razorbill ("Alca torda"). During a survey in 2008, "Paramysis intermedia" (from genus "Paramysis") was found in Gretagrund as a new species in the Baltic Sea.