Charleston Harbor
Encyclopedia
The Charleston Harbor is an inlet
Inlet
An inlet is a narrow body of water between islands or leading inland from a larger body of water, often leading to an enclosed body of water, such as a sound, bay, lagoon or marsh. In sea coasts an inlet usually refers to the actual connection between a bay and the ocean and is often called an...

 (8 sq mi/20.7 km²) 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...

 at Charleston, South Carolina
Charleston, South Carolina
Charleston is the second largest city in the U.S. state of South Carolina. It was made the county seat of Charleston County in 1901 when Charleston County was founded. The city's original name was Charles Towne in 1670, and it moved to its present location from a location on the west bank of the...

. The inlet is formed by the junction of Ashley
Ashley River (South Carolina)
The Ashley River is a blackwater / tidal river in South Carolina, rising from the Wassamassaw and Great Cypress Swamps in western Berkeley County. It consolidates its main channel about five miles west of Summerville, widening into a tidal estuary just south of Fort Dorchester...

 and Cooper
Cooper River (South Carolina)
The Cooper River is a mainly tidal river in the U.S. state of South Carolina. These cities are located along the river, Mt. Pleasant, Charleston, North Charleston, Goose Creek and Hanahan. Short and wide, it is joined first by the blackwater East Branch, then farther downstream, the tidal Wando River...

 rivers at 32°49′7.10"N 79°55′40.41"W. Morris
Morris Island
Morris Island is an 840 acre uninhabited island in Charleston Harbor in South Carolina, accessible only by boat. The island lies in the outer reaches of the harbor and was thus a strategic location in the American Civil War.-History:...

 and Sullivan's Island, shelter the entrance. Charleston Harbor is part of the Intracoastal Waterway
Intracoastal Waterway
The Intracoastal Waterway is a 3,000-mile waterway along the Atlantic and Gulf coasts of the United States. Some lengths consist of natural inlets, salt-water rivers, bays, and sounds; others are artificial canals...

.

Like most river mouths in the Southeast, the inlet is evidence of a drowned coastline
Submergent coastline
Submergent coastlines are stretches along the coast that have been inundated by the sea due to a relative rise in sea levels. This occurs due to either isostacy or eustacy....

, created by a rise in sea level in recent geologic
Geology
Geology is the science comprising the study of solid Earth, the rocks of which it is composed, and the processes by which it evolves. Geology gives insight into the history of the Earth, as it provides the primary evidence for plate tectonics, the evolutionary history of life, and past climates...

 time.

The harbor froze over sufficiently to allow ice-skating during the winter of 1784, as a consequence of the volcanic outpouring at Laki
Laki
Łąki may refer to the following places in Poland:*Łąki, Lower Silesian Voivodeship *Łąki, West Pomeranian Voivodeship *Łąki, Lublin Voivodeship...

 in Iceland
Iceland
Iceland , described as the Republic of Iceland, is a Nordic and European island country in the North Atlantic Ocean, on the Mid-Atlantic Ridge. Iceland also refers to the main island of the country, which contains almost all the population and almost all the land area. The country has a population...

during the summer of 1783.
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