Courtesy of WOWSA, Lake Lenape, Mays Landing, New Jersey. Lake Lenape Triathlon – Duathlon is a multi-sport 3-day event held on July 4th – 6th in Lake Lenape Park West. The Triathlon includes a 1-mile swim at Mays Landing, New Jersey that is held on July 4th. For more information, visit here. Copyright © 2008-2019 by World Open Water Swimming Association