 At this place the river falls into an estuary, where its current is affected by the tide; and from this place to its mouth it is a broad, deep, sluggish stream.About from its mouth the Hudson breaks through the rocky barrier of the highlands, forming the most easterly of the Appalachian Mountain ranges; and along its lower course it is bordered on the west by a nearly perpendicular wall of basaltic rock high, known as The Palisades.Above Troy, the Hudson receives the Hoosic River from the east and the Mohawk River from the west.