Duck Brook was one of the early sites on Mount Desert Island that was considered an essential experience by early rusticators and is still considered so today.
USGS does not distinguish between features named "mountain" and those named "hill." Furthermore, some features locally called either may be classified by USGS as a "ridge." ID Key: ACAD - Acadia National Park; GNIS - Geographic Names Information System (USA); GNS - Geographic Names System (Canada); NRHP - National Register of Historic Places.