Riverside State Park is a public recreation area located nine miles (14 km) northwest of Spokane in Nine Mile Falls, Washington. It is Washington's second largest state park, covering some 11,162 acres (4,517 ha) along the Spokane and Little Spokane rivers. The park is managed by the Washington State Parks and Recreation Commission. Areas of the park include the Bowl and Pitcher, the Nine Mile Recreation Area, the Little Spokane River Natural Area, the 600-acre (240 ha) off-road vehicle park, the equestrian trails area, and a portion of the 37-mile-long (60 km) Spokane River Centennial Trail. The Spokane House Interpretive Center has exhibits about the Spokane Indians, early pioneers, fur trappers, traders, the area's fort and military history, and Spokane House, the fur trading post established nearby. Park activities include camping, fishing, swimming, picnicking, boating, canoeing, kayaking, bird watching, wildlife viewing, ATV riding, horseback riding, biking, hiking and rock climbing. Campgrounds are located at the Bowl and Pitcher, Nine Mile Recreation Area, and Lake Spokane.