Rainier Beach is a set of neighborhoods in Seattle, Washington that are mostly residential. Also called Atlantic City, Rainier Beach can include Dunlap, Pritchard Island, and Rainier View neighborhoods. The neighborhood is located in the far southeastern corner of the city along Lake Washington. Its primary arterials are Rainier and Renton Avenues South. Neighborhood boundaries are informal and sometimes overlapping in Seattle; formal designations have not existed since 1910.