Between these two upland subregions lies the Central Lowland, an area of low elevation and relief, sloping gently upward from the Río Paraguay toward the Paraná Plateau. Small, isolated peaks are numerous, and it is here that the only lakes of any size are found. Although nearly flat surfaces occur in this subregion, the rolling terrain is extremely uneven. The Central Hill Belt encompasses the area in the vicinity of Asunción. For the most part it consists of a rolling plateau about 180 meters (591 ft) above sea level and 76 to 90 meters (249 to 295 ft) above the plain farther to the south. The first of these eroded extensions stretching westward of the Paraná Plateau-the Northern Upland-occupies the portion northward from the Aquidabán River ( Río Aquidabán) to the Apa River on the Brazilian border. The Northern Upland, the Central Hill Belt, and the Central Lowland constitute the lower terrain lying between the escarpment and the Río Paraguay.
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