Source: Hydrographic work undertaken in 1971 to 1972, 1990 to 1991 and 2001 with subsequent corrections. Surveying has been done from satellite images.

Fuente: Trabajos hidrogrficos efectuados en los aos 1971-1972, 1990-1991 y 2001 con correcciones posteriores. La topografa se ha realizado a partir de imgenes satelitales.