Environmental groups applauded President Joe Biden’s decision on Monday to enact a sweeping ban on new offshore oil and gas drilling along most of the U.S. coastline. But the ban had one glaring omission: It didn’t include the western Gulf of Mexico, where the country extracts most of its offshore oil.

President Joe Biden has announced prohibitions on future oil and gas drilling across parts of the Atlantic Ocean, the Pacific Ocean, the eastern Gulf of Mexico, and the Northern Bering Sea. This withdrawal of rights will not affect the majority of offshore drilling in the U.

President Joe Biden on Monday announced an executive action that will permanently ban future offshore oil and gas development in parts of the Atlantic and Pacific oceans in a way that could be especially difficult for the incoming Trump administration to undo.