Rhode Island (USA) is 13 times larger than Riverside, California.
Rhode Island, officially the State of Rhode Island and Providence Plantations, is a state in the New England region of the United States. Rhode Island is the smallest in area, the eighth least populous, but the second most densely populated of the 50 US states behind New Jersey. Wikipedia
Area: 208 km2 calculated
Riverside is a city in Riverside County, California, United States, located in the Inland Empire metropolitan area. Riverside is the county seat of the eponymous county and named for its location beside the Santa Ana River. Wikipedia