It is supplied with seawater from the Gulf of Mexico via Aransas Bay , and fed freshwater from the Aransas River , Mission River and Copano Creek .
Copano Bay is a northwestern extension of Aransas Bay , west of Rockport , Texas in Refugio and Aransas counties .
Copano Bay is supplied with seawater from the Gulf of Mexico via Aransas Bay , and fed freshwater from the Aransas River , Mission River and Copano Creek .
Copano Bay is a northwestern extension of Aransas Bay , west of Rockport , Texas in Refugio and Aransas counties .