At the foot of the Kisco Mountain is situated the Westchester and Harlem railroad depot. New Castle'is exceedingly well watered by rivers, rivulets and springs. The Saw Mill River (Nepera) takes its rise from two springs near the centre of the town, one of them situated on the land of Job Collins, the other on the property of Willett Kipps. The Bronx River (Aquehung) has its source in the Dark Valley of this town. The Mill River (Pocanteco) rises on the lands of Isaac Lownsberry.

There are two or three large ponds, which supply valuable mill seats. Kirby's Pond receives its waters from Simmons's Pond, while its outlet passes into the Pepemighting, or Kisco. Wampus Pond is situated on the boundary line between New and North Castle. This pond covers about fifty acres, and empties into the Byram (Armonck) River. Fish were never caught here until within a few years, when pike were put therein, which have multiplied exceedingly. a Upon the west side of Wampus Pond rises Prospect Hill, the property of Mr. Edward Quimby.6 It is impossible to describe the variegated prospect that meets the eye from its summit, a more extensive view is not to be had in the town. Near this hill an iron mine was opened seventy-four years ago ; but, the war commencing, put a stop to the project, which has never since been resumed.

The Chappequa sulphur springs, which have acquired some celebrity, are situated "four miles north-east of Sing Sing. They issue from a cleft in the rock, near the base of a hill about two hundred feet in height. The water, as it rises from the rocks, is transparent, but in its course deposites a reddish yellow powder. The salts held in solution are said to be sulphate of lime, chloride of calcium, and the muriate of iron, and manganese.