The Clark County Wetlands Park is the largest park in the Clark County, Nevada park system. The park is on the east side of the Las Vegas valley and runs from the various water treatment plants near the natural beginning of the Las Vegas Wash to where the wash flows under Lake Las Vegas and later into Lake Mead. The second purpose of the park is education. The displays within the park show visitors how the wash looked before major settlement occurred in the valley and the impact people have had on the environment.