or NEN, a river of England, Northamptonshire, is formed by two branches, one from the north, rising at Naseby, and the other from the west, rising near Staverton, a village S.W. of Daventry. These streams unite at Northampton, and thence the river flows towards the N.E., through a beautiful valley, and falls into the Wash. The Nene receives many tributaries, though of small size, from the left; but none from the right, as the hills present a steep side to it, and send their streams to the Ouse. Northampton and Peterborough are the principal towns on its course.