The Interior Department released a new regulation Friday that will affect 13 million acres in Alaska, prohibiting drilling for oil on the land.

The Management and Protection of the National Petroleum Reserve in Alaska rule will affect 40% of Alaska’s reserve, as 10.6 million acres will be completely protected by the Bureau of Land Management while the remaining amount will have limited protection. According to the Interior Department, this area is a “globally significant intact habitat for wildlife, including grizzly and polar bears, caribou and hundreds of thousands of migratory birds.”