Acadia National Park in Maine consists of more than 47,000 acres (19,000 ha) including much of Mount Desert Island, and associated smaller islands, off the Atlantic coast. It is the oldest American national park east of the Mississippi River. The park includes mountains, an ocean shoreline, woodlands, and lakes. In addition to Mount Desert Island, the park comprises much of the Isle au Haut, parts of Baker Island, and a portion of the Schoodic Peninsula on the mainland.

The park is home to some 40 different mammal including red and gray squirrels, chipmunks, white-tailed deer, moose, beaver, porcupine, muskrats, foxes, coyote, bobcats, and black bears. Many other marine species are observed in the surrounding area and waters.