Katahdin Woods and Waters National Monument is a U.S. national monument spanning 87,563 acres (137 sq mi) of mountains and forestland in northern Penobscot County, Maine, including a section of the East Branch Penobscot River. The monument is located on the eastern border of Maine's Baxter State Park. Native animals include moose, bobcats, bald eagles, salmon, and Canada lynx.

Baxter State Park is a large wilderness area permanently preserved as a state park in Northeast Piscataquis, Piscataquis County in north-central Maine, United States. It is in the North Maine Woods region and borders the Katahdin Woods and Waters National Monument on the east.