text: tell me the geographical information about amazon river?   it is located in south america,most voluminous,second longest,nevado mismi mouth atlantic ocean basin countries brazil (62.4%), peru (16.3%) bolivia (12.0%), colombia (6.3%) ecuador (2.1%) length 6,516 km (4,049 mi) source elevation 5,597 m (18,360 ft) avg. discharge 219,000 m³/s (7,740,000 ft³/s) basin area 6,915,000 km² (2,670,000 mi²)