Pilar Geijo Sets Río de la Plata Record Courtesy of Lucas Rivet, Asociación Cruce a Nado Río de la Plata, Río de la Plata, Argentina-Uruguay. Pilar Geijo has raced among the world's fastest professional marathon swimmers for nearly 15 years on the FINA UltraMarathon Swim Series. But she took time off of the professional circuit to do a famed solo