The Southwest Amazon Moist Forest stretches across four sub-basins of the upper Amazon Basin. The landscape here is relatively flat, except where the mountains of the Serra do Divisor range rise like an uplifted seam across part of the region. If you trekked across this large ecoregion, you would see myriad shifts in topography. In the north, 120 inches (3,048 mm) of rain drench the soil each year, creating lush, moist forests, while to the south, where only 60 to 80 inches (1,524-2,032 mm) of rain fall each year, the land is drier. Soils also vary greatly from one end of the region to the other. Areas of upland terra firme, or dry land, have nutrient-poor soils, while the ancient alluvial plains along the rivers host nutrient-rich soils.
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