As identified by the National Park Service, the Lower Seaboard Theater and the Gulf Approach campaigns of the Civil War encompass major military and naval operations that occurred at the southeastern coastal regions of the nation, including South Carolina, Florida, Mississippi, and Louisiana. Inland campaigns are included in the Western Theater or Trans-Mississippi Theater, depending on whether they were east or west of the Mississippi River.  The vast majority of coastal operations in Georgia are included in the Western Theater.
 

Campaigns:

Operations in Charleston Harbor (April 1861)

• Fort Sumter (South Carolina)

Operations of the Gulf Blockading Squadron (October 1861)

• Santa Rosa Island (Florida)

Operations Against Fort Pulaski (April 1862)

• Fort Pulaski (Georgia)

Expedition to, and Capture of, New Orleans (April-May 1862)

• Forts Jackson & Phillip (Louisiana)

• New Orleans (Louisiana)

Operations Against Charleston (June 1862)

• Secessionville (South Carolina)

• Simmon's Bluff (South Carolina)

Operations Against Tampa (June-July 1862)

• Tampa (Florida)

Operations Against Baton Rouge (July-August 1862)

• Baton Rouge (Louisiana)

• Donaldsonville (Louisiana)