This part of the larger park, which includes the Forest Park field headquarters, is heavily used by pedestrians entering Balch Creek Canyon from nearby city streets.[22] Further southeast, Wildwood Trail, while still in Forest Park, passes Pittock Mansion and its panoramic views of Portland and five volcanic peaks: Mounts Rainier, Adams, St. Helens, Hood, and Jefferson.[2] Shortly thereafter, the trail connects to adjoining Washington Park and attractions such as the Oregon Zoo. From this point and from more remote Forest Park trailheads near the St. Johns Bridge, other components of the 40 Mile Loop system of trails encircle the city. They follow the Willamette and Columbia rivers, the Columbia Slough and the Springwater Corridor along Johnson Creek and extend to the eastern suburbs of Fairview, Gresham and Boring.[23] This trail network links more than 30 separate parks that offer diverse recreational opportunities, such as horse-back riding, in-line skating, canoeing, and viewing of wetland wildlife, in addition to hiking and biking.[24] It connects to other trail systems such as Discovery Trail in Clark County, Washington, and the Terwilliger Trail running through Tryon Creek State Natural Area to Lake Oswego.[23]