SOUTH AMERICA: International River Basin register (updated August 2012) AFRICA | ASIA | EUROPE | NORTH AMERICA | SOUTH AMERICA || Footnotes | Documentation Basin Name Total area of basin (sq. km) (1)   Country name Area of country in basin (sq. km) Percent area of basin in country (%) Amacuro 5,600 Venezuela 4,900 87   Guyana 700 13   Amazon (44) 5,883,400 Brazil 3,670,300 62   Peru 956,500 16.26   Bolivia 706,700 12   Colombia 367,800 6   Ecuador 123,800 2   Venezuela 40,300 1   Guyana 14,500 <1   Suriname 1,400 <1   French Guiana 30 <1   Aviles 300 Argentina 200 89   Chile 30 11   Aysen 13,600 Chile 13,100 96   Argentina 500 4   Baker 30,800 Chile 21,000 68   Argentina 9,800 32   Barima 2,100 Guyana 1,100 52   Venezuela 1,000 44   Cancoso/Lauca 23,500 Bolivia 20,200 86   Chile 3,400 14   Carmen Silva/Chico 1,700 Argentina 1,000 59   Chile 700 41   Catatumbo 31,000 Colombia 19,600 63   Venezuela 11,400 37   Chira (44) 15,700 Peru 9,800 62   Ecuador 5,800 38   Chuy 200 Brazil 100 75   Uruguay 60 25   Comau 900 Chile 900 89   Argentina 80 11   Corantijn/Courantyne (45) 41,800 Guyana 21,700 52   Suriname 19,900 48   Brazil 80 <1   Cullen 600 Chile 500 83   Argentina 100 17   Essequibo (46) 239,500 Guyana 162,100 68   Venezuela 52,400 22   Suriname 24,300 10   Brazil 200 <1   Gallegos-Chico 11,600 Argentina 7,000 61   Chile 4,600 39   Jurado 700 Colombia 500 71   Panama 100 29   La Plata (47, 48) 2,954,500 Brazil 1,379,300 47   Argentina 817,900 28   Paraguay 400,100 14   Bolivia 245,100 8   Uruguay 111,600 4   Lagoon Mirim 55,000 Uruguay 31,200 57   Brazil 23,800 43   Lake Fagnano (49) 3,200 Argentina 2,700 85   Chile 500 15   Lake Titicaca-Poopo System 111,800 Bolivia 63,000 56   Peru 48,000 43   Chile 800 1   Maroni (50) 65,000 Suriname 37,500 58   French Guiana 27,200 42   Brazil 200 <1   Mataje 700 Ecuador 500 71   Colombia 200 29   Mira 12,100 Colombia 6,200 52   Ecuador 5,800 48   Oiapoque/Oyupock 23,300 French Guiana 13,700 60   Brazil 9,500 40   Orinoco 927,400 Venezuela 604,500 65   Colombia 321,700 35   Brazil 800 <1   Palena 13,300 Chile 7,300 55   Argentina 6,000 45   Pascua 13,700 Chile 7,300 54   Argentina 6,400 46   Patia 21,300 Colombia 20,800 98   Ecuador 500 2   Puelo 8,400 Argentina 5,500 66   Chile 2,900 34   Rio Grande (South America) 8,000 Argentina 4,000 50   Chile 4,000 50   San Martin 700 Chile 600 88   Argentina 80 12   Seno Union/Serrano 6,500 Chile 5,700 90   Argentina 700 10   Tumbes-Poyango (44) 5,000 Ecuador 3,600 71   Peru 1,400 29   Valdivia 15,000 Chile 14,700 99   Argentina 100 1   Yelcho 11,100 Argentina 6,900 62   Chile 4,200 38   Zapaleri (51) 2,600 Chile 1,600 58   Argentina 500 20   Bolivia 500 22   Zarumilla (44) 4,300 Ecuador 3,400 79   Peru 900 21