The Gulf Coast Network (GULN) is one of 32 networks included in the Servicewide Inventory and Monitoring program. The GULN includes eight units of the National Park System: Big Thicket National Preserve, Gulf Islands National Seashore, Jean Lafitte National Historical Park and Preserve, Natchez Trace Parkway, Palo Alto Battlefield National Historic Site, Padre Island National Seashore, San Antonio Missions National Historical Park, and Vicksburg National Military Park. The total area of land managed within the network is more than 440,500 acres.