Katahdin Woods and Waters National Monument is a U.S. national monument spanning 87,563 acres 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, b…Katahdin Woods and Waters National Monument is a U.S. national monument spanning 87,563 acres 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.