GREEN LAKE. Green Lake, a tidal lake twelve miles southwest of Port Lavaca in western Calhoun County (at 28°32' N, 96°48' W), drains through Mission Lake into Guadalupe Bay. The lake is named for its greenish water. It encompasses about 10,000 acres and is one of the largest natural freshwater lakes in Texas, in spite of its proximity to salt water. The local terrain is a very grassy, poorly drained freshwater marsh that provides habitat for a variety of waterfowl. The rural community of Green Lake, about a mile to the southeast, is the nearest settlement. Green Lake provides fishing and water sports for area residents.