Land and Resources, Natural Regions
Uruguay River, Haedo, Rio Negro, principal river, hilly region
The terrain in the south consists of grassy, rolling plains. Along the Atlantic coast, lagoons, sandy beaches, and sand dunes extend inland for 8 km (5 mi) or more. In the north and northwest is a low plateau, the Cuchilla de Haedo, diversified by ridges of hills that rise to an extreme height of 377 m (1,237 ft) above sea level. The eastern portion of the country is dominated by the Cuchilla Grande, a hilly region that extends generally south from Brazil to a point near Punta del Este; the Cuchilla Grande rises to 501 m (1,644 ft) at Mirador Nacional, the highest elevation in Uruguay.
The Cuchilla Grande acts as a drainage divide between the shorter streams flowing east to the Atlantic and streams flowing west to the Uruguay River. West of the divide the country is gently rolling; the only breaks in this surface occur along the relatively narrow river valleys. Woodland occurs chiefly along the riverbanks. The Rio Negro is the principal river of the Uruguayan interior; only its lower portion is navigable. The Uruguay River is navigable from its mouth to Salto.
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