The Ogeechee River arises in the Georgia Piedmont, but the Coastal Plain contribues to most of its flow.  It is a "Black Water" river, carrying a high load of dissolved organic carbon that imparts a "Tea" color to the water.  Unlike other black water rivers, the Ogeechee has a high pH (near 7.0) due to a large input of carbonate-rich water from Magnolia Springs.  Flow in the Ogeechee River averages 100 cubic meters per second and the drainage basin covers 7,000 square kilometers.