The Webb River is a 16.8 miles (27 km) river in western Maine

Maine

Maine is a state in the New England region of the northeastern United States, bordered by the Atlantic Ocean to the east and south, New Hampshire to the west, and the Canadian provinces of Quebec to the northwest and New Brunswick to the northeast. Maine is both the northernmost and easternmost...

. It is a tributary of the Androscoggin River

Androscoggin River

The Androscoggin River is a river in the U.S. states of Maine and New Hampshire, in northern New England. It is long and joins the Kennebec River at Merrymeeting Bay in Maine before its water empties into the Gulf of Maine on the Atlantic Ocean. Its drainage basin is in area...

, which flows to the Kennebec River

Kennebec River

The Kennebec River is a river that is entirely within the U.S. state of Maine. It rises in Moosehead Lake in west-central Maine. The East and West Outlets join at Indian Pond and the river then flows southward...

 and ultimately the Atlantic Ocean

Atlantic Ocean

The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...

.

The Webb River begins at the outlet of Webb Lake near the southern border of the town of Weld

Weld, Maine

Weld is a town in Franklin County, Maine, United States. The population was 402 at the 2000 census. Set beside Webb Lake and almost surrounded by mountains, Weld is noted for its scenic beauty. It is home to Mount Blue State Park and Camp Kawanhee for Boys....

 and flows south, quickly entering the town of Carthage

Carthage, Maine

Carthage is a town in Franklin County, Maine, United States. The population was 520 at the 2000 census.-History:First known as Plantation No. 4, Abbott's Purchase, it was part of a large tract of land bought in 1815 by Jacob Abbott of Wilton, New Hampshire from Jonathan Phillips of Boston, who had...

, where it turns southwest, then south again. The southernmost 6 miles (10 km) of the river forms the boundary between the towns of Mexico and Dixfield. The river enters the Androscoggin just west of the village of Dixfield. The entire course of the river is paralleled by Maine Route 142.