Acadia boasts varied and dramatic scenery including a coastline of chiseled granite, the ocean dotted with islands, 17 mountain peaks (together constituting the highest headlands along the eastern seaboard), close to a dozen glacial lakes and ponds, and Somes Sound, the only fjord (a glacially carved, u-shaped valley bordered by steep cliffs) on the East Coast of the United States.
In shape, Mount Desert Island resembles a lobster claw. Many of Acadia's best-known attractions are on the eastern side of the "claw," which is separated from the western side by Somes Sound. The park's western half features five mountains, numerous salt marshes and nature trails, and some of the best bird-watching in New England. The remainder of Acadia National Park consists of the dazzling Schoodic Peninsula and several offshore islands, including Baker Island and remote Isle au Haut.