From the Wikipedia page [1]
Järva County (Estonian: Järva maakond), or Järvamaa (German: Jerwen, Latin: Jervia), is one of 15 counties of Estonia. It is situated in central part of the country and borders Lääne-Viru County to the east, Jõgeva County to the south-east, Viljandi County to the south, Pärnu County to the south-west, Rapla County to the west, and Harju County to the north. In January 2009 Järva County had a population of 29,940 – constituting 2.7% of the total population in Estonia.