Question: Which U.S. National Monument spans 87563 acres of mountains and forestland, and borders a large wilderness area located in Piscataquis County in north-central Maine, United States?
Sentence (from "Katahdin Woods and Waters National Monument"): Katahdin Woods and Waters National Monument is a U.S. National Monument spanning 87563 acre of mountains and forestland in northern Penobscot County,Maine, including a section of the East Branch Penobscot River.
Relevant evidence: Yes