Hardscrabble River is the estuary

Estuary

An estuary is a partly enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea....

 of Wilson Stream, a small river in Washington County

Washington County, Maine

Washington County is a county located in the U.S. state of Maine. In 2010, its population was 32,856. Its county seat is Machias.Sometimes referred to as "Sunrise County" because it is the easternmost county in the United States, and it is often where the rising sun first shines on the 48...

, 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...

.
From its source (44.996°N 67.282 °W) in Charlotte

Charlotte, Maine

Charlotte is a town in Washington County, Maine, United States. The town was named for the wife of legislator William Vance. The population was 324 at the 2000 census.-Geography:...

, Wilson Stream runs about 10 miles (16 km) southeast to Dennys Bay

Dennys Bay

Dennys Bay is a bay in Washington County, Maine.Located between the towns of Pembroke, Dennysville, and Whiting, it extends roughly 5 mi. from Dennysville to Cobscook Bay and is 2 mi. at its widest....

.
It changes name to Hardscrabble River at about the point where it is crossed by U.S. Route 1

U.S. Route 1 in Maine

In the U.S. state of Maine, U.S. Route 1 is a major north–south state highway serving the eastern part of the state. It parallels the Atlantic Ocean from New Hampshire north through Portland, Brunswick, and Belfast to Calais, and then the St. Croix River and the rest of the Canadian border...

 (44.9338°N 67.2261 °W).
This section of the stream separates Pembroke

Pembroke, Maine

Pembroke is a town in Washington County, Maine, United States. The population was 879 at the 2000 census. The town is home to reversing falls on Mahar's Point.-History:...

 on its left bank from Dennysville

Dennysville, Maine

Dennysville is a town in Washington County, Maine, United States. The population was 319 at the 2000 census.-Geography:According to the United States Census Bureau, the town has a total area of , of which, of it is land and of it is water....

 and Edmunds on its right.