Riva is a census-designated place (CDP) in Anne Arundel County, Maryland, United States. The population was 4,076 at the 2010 census. The area is scenic, especially where the two-lane Riva Road crosses theSouth River on a bridge. The area is growing with large new homes as the suburbs of Annapolis grow outward. Aisquith Farm E Archeological Site was listed on the National Register of Historic Places in 1991.According to the United States Census Bureau, the CDP has a total area of 2.9 square miles (7.5 km2), of which 2.5 square miles (6.4 km2) is land and 0.46 square miles (1.2 km2), or 15.37%, is water.