IWRM in the Puyango-Tumbes, Catamayo-Chira and Zarumilla Transboundary Aquifers and River Basins is a project of IW:LEARN. The project aims to enhance bi-national efforts of Peru and Ecuador for Integrated Transboundary Water Resources Management (ITWRM) in the three main aquifers and watersheds shared by the two countries in the Pacific Ocean drainage basin - Puyango-Tumbes, Catamayo-Chira and Zarumilla.