This report is an areal study of a portion of the south coast of Puerto Rico. It follows similar studies of the Guanica, Guayanilla-Yauco, Tallaboa Valley, and Ponce areas to the west and the Jobos area to the east. It basically is an inventory of the water resources during one year. To this extent it carries no long-term information; however, as rainfall data is available for 50 years or so at some sites within the study area, we can make a qualitative estimate of the water resources under more extreme conditions. The purpose of this report, then, is to evaluate the gross hydrologic features of the area for the future management of the water resources.