The Shawangunk Kill is a 47.2mi stream that flows northward through Orange, Sullivan and Ulster counties, New York, in the United States. It is the largest tributary of the Wallkill River.It takes its name from the neighboring Shawangunk Ridge, where it rises in the town of Greenville, then flowing down into the valley. For part of its length, it forms the northwestern boundary of Orange County, with first Sullivan and then Ulster County along the other side.CourseFrom its source in Greenville, the Shawangunk flows steadily northeastward to Mill Pond, near Mount Hope, by which point it has already lost almost half its original elevation. It passes through fields and woods east of Otisville. At the hamlet of New Vernon, it becomes the Orange-Sullivan county line and shortly thereafter receives its first named tributary, the Little Shawangunk Kill.It begins to widen a bit at Bloomingburg, and north of that community it is crossed by NY 17, the busiest road along the kill. Several miles to the north, the confluence of another tributary, the Platte Kill, marks the point where Orange, Sullivan and Ulster counties come together as the stream bends slightly towards a more eastern heading.
