Ladataan karttaa...
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Kotkajärvi on yksi Kokemäenjoen vesistön alkulähteistä. Sen vesi laskee järven luoteiskolkasta lähtevää Tarpionjokea pitkin Muulijärveen. Järven suurin syvyys on 13 metriä ja rantaviivan pituus on 14,5 kilometriä. Kotkajärven ravinnetaso on karu ja uimaveden laatu erinomainen. Rannoille on rakennettu noin 130 kesämökkiä ja taloa. Kotkajärven seudulla on noin 60 vakinaista asukasta sekä kesäasukkaita noin 400 - 500.