The drainage basin of the river is approximately 1,495 square miles, runningsoutheastward, determining part of the boundary between the states of New Hampshire and Maine, and emptying into the Atlantic Ocean below Portsmouth, New Hampshire.
The drainage basin of the river is approximately 1,495 square miles, creating the third fastest-flowing navigable river in the world. It runs southeastward, determining part of the boundary between the states of New Hampshire and Maine, and empties into the Atlantic Ocean below Portsmouth, New Hampshire.