The Mississippi Delta, also known as the Yazoo–Mississippi Delta, or simply the Delta, is the distinctive northwest section of the U.S. state of Mississippi that lies between the Mississippi and Yazoo rivers. The region has been called "The Most Southern Place on Earth", because of its unique racial, cultural, and economic history. It is 200 miles (320 km) long and 87 miles (140 km) across at its widest point, encompassing about 4,415,000 acres (17,870 km²), or, almost 7,000 square miles of alluvial floodplain. Originally covered in hardwood forest across the bottomlands, it was developed as one of the richest cotton-growing areas in the nation before the American Civil War (1861–1865). The region attracted many speculators who developed land along the riverfronts for cotton plantations; they became wealthy planters dependent on the labor of people they enslaved, who composed the vast majority of the population in these counties well before the Civil War, often twice the number of whites.