This document summarizes two case studies of transboundary aquifers between Morocco and Algeria, and Morocco and Mauritania. It discusses the shared watersheds and aquifers between the countries, including the importance of the Senonian aquifer for water supply. It also outlines current independent management practices for the aquifers and the need for cooperation between countries to prevent overexploitation and pollution of the shared groundwater resources. The document concludes by presenting challenges and perspectives for improving understanding of the aquifers and establishing organizational and legal frameworks for integrated water resources management through information sharing, training, and cooperation between the countries.