 The Swift River is located only four miles south of the larger and longer Swift River which parallels the Kancamagus Highway in the White Mountain National Forest.The Swift River begins at the confluence of Paugus Brook and Durrell Brook in the northern part of Tamworth, New Hampshire, at the base of Mount Chocorua.The river flows south through a narrow valley, quickly being joined by the Wonalancet River from the west.