From the Wikipedia page [1]
Pärnu County (Pärnu maakond), or Pärnumaa (Kreis Pernau), is one of 15 counties of Estonia. It is situated in south-western part of the country, on the coast of Gulf of Riga, and borders Lääne and Rapla counties to the north, Järva and Viljandi counties to the east, and Latvia to the south.