evidence: The western part of its southern border with Tacuarembó Department is formed by Río Tacuarembó, with its tributaries flowing through most of the department. From west to east, these are: Arroyo Rubio Chico, Arroyo Laureles which also forms part of the southern border of the department, Arroyo Cuñapirú with its tributaries Arroyo Batoví, Arroyo Mangueras, Arroyo de los Médanos, Arroyo Corrales and Arroyo Zapucay, Arroyo Yaguarí with its tributary Arroyo Carpintería, and Arroyo Caraguatá with its tributary Arroyo Coronilla. [...] The railroad track Montevideo-Rivera is active for cargo trains of the Línea Rivera, which connects with the railroad infrastructure of Brazil. A small length of this track, from Montevideo to Florida only, is also active for passenger trains.