Swimming Upstream At The Maratón Contracorriente Las Estacas Sponsored by KAATSU Global, Huntington Beach, California. In Las Estacas, the Maratón Contracorriente las Estacas is an upstream 1 km river swim in a naturally beautiful national park of Mexico. Held in the state of Morelos, the unique Las Estacas race is held every May and October […]