The cape fear river basin is the largest in north carolina. which statement best describes a river basin? a) river basins are tributaries that drain into a much larger water shed. b) a river basin is a large channel of water that is always flowing down a slope. c) it contains a major river and all the streams and creeks that flow into that river. d) it is the water found in cracks and pores in sand, gravel and rocks below the earth’s surface.