Jefferson County is a county in the Coastal Plain or Gulf Prairie region of Southeast Texas. The Neches River forms its northeastern boundary. As of the 2020 census, the population was 256,526. The county seat is Beaumont. Jefferson County has the highest percentage of African Americans in the state of Texas.

Sabine Lake is a bay on the Gulf coasts of Texas and Louisiana, located approximately 90 miles (140 km) east of Houston and 160 miles (260 km) west of Baton Rouge, adjoining the city of Port Arthur. The lake is formed by the confluence of the Neches and Sabine Rivers and connects to the Gulf of Mexico through Sabine Pass. It forms part of the Texas–Louisiana border, falling within Jefferson and Orange Counties in Texas and Cameron Parish, Louisiana.