Martin Brook is a river in Otsego County, New York. It converges with the Susquehanna River in Unadilla.

Martin Brook
Location of the mouth of Martin Brook
Location
Country	United States
State	New York
County	Otsego
Physical characteristics
Source
• coordinates	42°21′41″N 75°19′12″W
Mouth	Susquehanna River
• coordinates	42°19′23″N 75°18′42″W[1]
• elevation	981 ft (299 m)

References