The selected location is:

The elevation is 121 m ( 398 ft )
The gradient is: 3.7 percent
The aspect direction is: 84.8 degrees or E
The local roughness is: 4.6 or average
The location as decimal degrees (X,Y;Z) = -73.8432, 41.0904; 121 m

The state and county are New York: Westchester County 36119
The HUC is Lower Hudson 02030101; Place point in HUC
The Omernik ecoregion is Northeastern Coastal Zone (more typical) 59
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Nearby named places (in order by distance)

1. New Croton Aqueduct; New York: Westchester Co. -73.8432, 41.0904 at a distance of 2 m
2. Kykuit Hill; New York: Westchester Co. -73.8446, 41.0895 at a distance of 153 m
3. Sleepy Hollow head; -73.8493, 41.0937 at a distance of 628 m
4. Pocantico Hills; New York: Westchester Co. -73.8360, 41.0945 at a distance of 758 m
5. Cedar Hill; New York: Westchester Co. -73.8540, 41.0929 at a distance of 947 m
6. Rockefeller Brook head; -73.8343, 41.0968 at a distance of 1032 m
7. Sleepy Hollow mouth; New York: Westchester Co. -73.8485, 41.0995 at a distance of 1103 m
8. Old Croton Aqueduct; New York: Westchester Co. -73.8571, 41.0901 at a distance of 1167 m
9. Rockefeller Brook mouth; New York: Westchester Co. -73.8490, 41.1004 at a distance of 1212 m
10. Tarrytown Reservoir; New York: Westchester Co. -73.8324, 41.0829, ( 252 ft ) at a distance of 1233 m

The 7.5 minute series topographic maps for that area