The headwater lies within Woodcliff Lake and runs south through Hillsdale and into Washington Township. There it runs into Schlegel Lake before continuing south and east into Westwood. In Westwood, it runs into Bogert Pond before briefly turning north and joining the Pascack Brook at the border between Westwood and River Vale.
At least one late 18th-century map labels Musquapsink Brook "Little Pascack River" (the modern Pascack Brook is shown as "Great Pascack River").
- Leiby, Adrian C. (1962). The Revolutionary War in the Hackensack Valley. Rutgers University Press. inset, "Carte d'une partie de la Province de Newyork et des Jerseys, circa 1781" (Karpinski collection, New York Public Library).
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