Colonia is one of the most populated Departamentos of Uruguay. It is located in the Southwest, on the littoral where the Uruguay and Paraná Rivers flow into the Plata River. It limits on the North with Soriano, on the Northeast with Flores, and on the East with San José. To the South and the West the Plata River separates it from Buenos Aires, the capital city of Argentina. Its capital city is Colonia del Sacramento, 177 Km from Montevideo.