The floodplain forest of Iquitos is the peculiar ecoregion which surrounds the city, and is characterized by a várzea forest called Iquitos varzea. Its alluvial detail is the motive why intense rainy seasons easily reach these areas flood. In the natural cycle, the trees drop their leaves and other organic waste to the soil, and become humus. Rain washes these nutrients into rivers, which gives that blonde color, called tannin. Immediately, this cycle repeats.
