|Location||Gulf of Riga|
Gretagrund (or Greta-Grund) is a reef located few km southeast of Ruhnu island in the Gulf of Riga, Estonia. Since 12 August 2010 the 146.50 km2 (56.56 sq mi; 36,200 acres) 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 Paramysis genus) was found in Gretagrund as a new species in the Baltic Sea.
- "Gretagrundi hoiuala võetakse kaitse alla". ERR (in Estonian). 12 August 2010. Retrieved 9 August 2011.
- "Gretagrundi hoiuala" (in Estonian). Keskkonnaregister. Retrieved 9 August 2011.
- "Mereala loodusväärtuste uuringu käigus leiti Ruhnu lähedalt uus liik" (in Estonian). Bioneer. 17 February 2009. Retrieved 9 August 2011.
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