The Green River Trail is a 19.6-mile pedestrian and bicycle trail in King County, Washington, USA. It runs along the banks of the Duwamish and Green Rivers, crossing the river several times on bridges. The trail goes through a variety of landscapes, ranging from industrial to rural. The north end of the trail is near the turning basin of the Duwamish Waterway, near the south Seattle city limits. Heading upriver, the trail goes by Cecil Moses Park.