The East Branch of the Dead Diamond River rises in the town of Pittsburg between 3,627-foot (1,106 m) Stub Hill and 3,230-foot (980 m) Diamond Ridge. Nearly the entire length of the river is in Pittsburg, with a small portion at its southern end in the Atkinson and Gilmanton Academy Grant. A highlight along the river are the 40-foot-high (12 m) Garfield Falls.