The stream headwaters are at  and elevation of approximately 540 feet in Sullivan County just north of Wurtsboro and connected to the Delaware and Hudson Canal. The stream flows to the southwest paralleling U.S. Route 209 passing under New York Route 17 southeast of Wurtzboro. The stream enters Orange County at the village of Westbrookville. The stream continues to the southwest crossing under New York Route 211 to its confluence with the Neversink River at Coordinates: at an elevation of 459 feet. The confluence is just northeast of the community of Myers Grove.
Basher Kill was named after Bashee, a local Native American woman. Many variant spellings have been recorded, including "Ba-sha Kill", "Basha's Kill", "Basher's Kill", "Bashers Kil", Bashers Kill", and "Bashes Kil".
The stream flows through Basha Kill Wildlife Management Area, a manmade wetland maintained by the New York State Department of Environmental Conservation (NYSDEC) as a New York State Wildlife Management Area. The NYSDEC built a dam along the watercourse in the 1970s to preserve the Basha Kill and its wildlife.
- U.S. Geological Survey Geographic Names Information System: Basher Kill
- Eager, Samuel Watkins (1846). An Outline History of Orange County: Together with Local Tradition and Short Biographical Sketches of Early Settlers, Etc. T. E. Henderson. p. 392.
- Wurtzboro, NY, 7.5 Minute Topographic Quadrangle, USGS, 1943 (1954 rev.)
- Yankee Lake, NY, 7.5 Minute Topographic Quadrangle, USGS, 1966 (1990 rev.)
- Otisville, NY, 7.5 Minute Topographic Quadrangle, USGS, 1969 (1979 rev.)
- "About The Basha Kill". Basha Kill Area Association. Retrieved 10 March 2018.
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