Riverside State Park is a Washington state park park located 9 miles (14 km) northwest of Spokane in Nine Mile Falls. It is the largest state park in Washington. Park areas include the Bowl and Pitcher, Nine Mile Recreation Area, a 600-acre (240 ha) off-road vehicle park, an equestrian area, a 1,500-acre (610 ha) Little Spokane River natural area, the Spokane House Interpretive Center, and the 37-mile (60 km) long Spokane River Centennial Trail.