The country is divided west-to-east into four well defined regions, the first three being of roughly equal breadth. The four regions extend north and south and are known as the high, middle, and low veld, and the Lebombo plain and escarpment. The high veld on the west has an average altitude of 1,050 m to 1,200 m (3445 to 3,937 ft). The middle veld averages about 450 to 600 m (1,476 to 1,969 ft), and the low or bush veld less than 300 m (984 ft). The Lebombo plain, at an average height of 610 m (2,000 ft), extends to the Lebombo escarpment, which is part of the Lebombo Mountains in the east. The entire country is traversed by rivers or streams, making it one of the best watered areas in southern Africa.