The eastern headwaters of the Senegal thus drain a large area adjacent to the upper Niger.
The headwaters of the main arm of the Tigris have their source in the vilayet.
In this neighbourhood the county includes the headwaters of the Lea, and thus a small portion of it falls within the Thames basin.
The seven new departments are: Atlantico, taken from the northern extremity of Bolivar; Caldas, the southern part of Antioquia; Galan, the southern districts of Santander, including Charala, Socorro, Velez, and its capital San Gil; Huila, the southern part of Tolima, including the headwaters of the Magdalena and the districts about Neiva and La Plata; Narino, the southern part of Cauca extending from the eastern Cordillera to the Pacific coast; Quesada, a cluster of small, wellpopulated districts north of Bogota formerly belonging to Cundinamarca, including Zipaquira, Guatavita, Ubate and Pacho; and Tundama, the northern part of Boyaca lying on the frontier of Galan in the vicinity of its capital Santa Rosa.
Both of these streams have their headwaters almost in contact with those of the river Paraguay.