Greenwood Lake is an interstate lake approximately 9 miles long straddling the border of New Jersey and New York State. The lake is in West Milford Township, New Jersey (in Passaic County) and Greenwood Lake, New York (in Orange County).
The lake was originally called Long Pond. It was dammed up to increase the size of the lake for water power downstream. During the resort era, several steamboats operated on the lake, the most famous and grand was the two deck steamer, Montclair. These steamboats met the trains and took passengers to the various resorts around the lake in both states.
There is a seaplane area on Greenwood Lake, a few large marinas and lakeside restaurants with docks. There is a public airport called Greenwood Lake Airport just south of the lake on top of a mountain ridge which has two landing strips; one is long enough to handle small jets. Plus there is one private airport in West Milford township on a private estate.