Map of Connecticut highlighting the Connecticut River Estuary region.
The Lower Connecticut River Valley is a region of the state of Connecticut focused around the juncture where the Connecticut River meets Long Island Sound. It includes towns in southern Middlesex County and the western edge of New London County. It is located in the southeastern-central part of the state and includes the towns of Chester, Clinton, Deep River, Essex, Killingworth, Lyme, Old Lyme, Old Saybrook, and Westbrook.
Route 154 (formerly Route 9A) runs along the river starting in Middletown and ending in Old Saybrook. The road is designated as a scenic highway, popular with motorcycle tourists.