The Submerged Lands Act (SLA) boundary divides offshore State and Federal waters. This boundary can move over time as changes in the coastline occur. The SLA allows the boundary to be permanently fixed (immobilized) by the U.S. Supreme Court. Once a SLA boundary is fixed, ambulations of the coastline have no effect on the boundary location. Fixing provides certainty to boundaries of offshore leases. BOEM is actively working with coastal states interested in fixing their SLA boundary.