High Quality Content by WIKIPEDIA articles! St. Charles Bay is an inlet of Aransas Bay in Aransas County, Texas. It is flanked by Lamar peninsula on the west and Blackjack peninsula on the east. The bay hosts a valued ecosystem for the endangered Whooping Crane, and is a prime location for birding and fishing. Goose Island State Park and the Aransas National Wildlife Refuge are located along the bay`s shores, attracting nature enthusiasts year-round.