sentences:  Precipitation is among the highest in the world, with an average of per year and some areas that receive as much as per year.These high levels of precipitation support a number of rivers, including the Atrato River, San Juan River, Patía River, Baudó River and Mira River.The population of the region is mainly Afro-Colombian (it also includes several indigenous settlements), and the economy is based on mining (gold and platinum), timber, fishing, cattle raising and agriculture (particularly the cultivation of borojo, banana and plantain).