There are three chains of low and rounded hills in the department. These chains of are known as "cuchillas" in the country. At the northwest end of the department is the "Cuchilla de Haedo", one of the most important "cuchilla" of the country, coming from the south; it meets the "Cuchilla Negra" that comes from the north. Between these two hill ranges is the "Cerro de los Peludos" hill. Along the borders with Brazil, to the north, runs the "Cuchilla de Santa Ana".