The Wilmington River is a 17.3 miles (27.8 km) tidal river in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Georgia

Georgia (U.S. state)

Georgia is a state located in the southeastern United States. It was established in 1732, the last of the original Thirteen Colonies. The state is named after King George II of Great Britain. Georgia was the fourth state to ratify the United States Constitution, on January 2, 1788...

. It flows through Chatham County

Chatham County, Georgia

Chatham County is a county located in the U.S. state of Georgia. The county seat and largest city is Savannah. In the official US Census of 2010, Chatham County had a total population of 265,128 . Chatham is the most populous Georgia county outside the Atlanta metropolitan area...

 along the east side of the city of Savannah

Savannah, Georgia

Savannah is the largest city and the county seat of Chatham County, in the U.S. state of Georgia. Established in 1733, the city of Savannah was the colonial capital of the Province of Georgia and later the first state capital of Georgia. Today Savannah is an industrial center and an important...

. At its north end, it connects with the Savannah River

Savannah River

The Savannah River is a major river in the southeastern United States, forming most of the border between the states of South Carolina and Georgia. Two tributaries of the Savannah, the Tugaloo River and the Chattooga River, form the northernmost part of the border...

, then travels southwest past Savannah, then turns southeast and ends in Wassaw Sound

Wassaw Sound

Wassaw Sound is a bay of the Atlantic Ocean on the coast of Georgia, United States near Savannah where which the Wilmington River flows.-American Civil War naval battle:...

, an arm of 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...

. South of Savannah, it passes between several islands, including Whitemarsh Island, Wilmington Island and Cabbage Island to the east, and Dutch Island, Skidaway Island, and Wassaw Island

Wassaw Island

Wassaw Island is one of the Sea Islands. It is located on the Atlantic Ocean off the coast of the U.S. state of Georgia and is part of Chatham County. The island and its surrounding marshlands are part of the Wassaw National Wildlife Refuge, which has a total area of of marsh, mudflats, and tidal...

to the west and south.