Bonita is politically designated as an unincorporated community, bounded by the incorporated cities of Chula VistaSan Diego and National City, it is closely associated with the geography of the Lower Sweetwater Valley. Thus considered, Bonita occupies about a five-mile (8 km) stretch of the Sweetwater River, its valley, and surrounding hills on either side, bounded upstream (east) by the Sweetwater Reservoir, and downstream (west) effectively by Interstate 805. The community crosses west of I-805—an area less than 160 acres (0.65 km2)—reaching as far south and west as East H Street and Hilltop Drive. Its northern boundary is State Route 54 and its southern extent reaches approximately one mile (2 km) south of the river.