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South America: International River Basin register
| Basin Name |
Total area of basin (sq. km) (1) |
Country name |
Area of country in basin (sq. km) |
Percent area of country in basin (%) |
| Amacuro |
5 600 |
Venezuela |
4 900 |
86.89 |
| Guyana |
700 |
13.11 |
| Amazon (44) |
5 883 400 |
Brazil |
3 670 300 |
62.38 |
| Peru |
956 500 |
16.26 |
| Bolivia |
706 700 |
12.01 |
| Colombia |
367 800 |
6.25 |
| Ecuador |
123 800 |
2.10 |
| Venezuela |
40 300 |
0.68 |
| Guyana |
14 500 |
0.25 |
| Suriname |
1 400 |
0.02 |
| French Guiana |
30 |
0.00 |
| Aviles |
300 |
Argentina |
200 |
88.72 |
| Chile |
30 |
11.28 |
| Aysen |
13 600 |
Chile |
13 100 |
96.07 |
| Argentina |
500 |
3.93 |
| Baker |
30 800 |
Chile |
21 000 |
68.15 |
| Argentina |
9 800 |
31.83 |
| Barima |
2 100 |
Guyana |
1 100 |
51.05 |
| Venezuela |
1 000 |
47.84 |
| Cancoso/Lauca |
23 500 |
Bolivia |
20 200 |
85.72 |
| Chile |
3 400 |
14.28 |
| Carmen Silva/Chico |
1 700 |
Argentina |
1 000 |
59.70 |
| Chile |
700 |
40.30 |
| Catatumbo |
31 000 |
Colombia |
19 600 |
63.15 |
| Venezuela |
11 400 |
36.75 |
| Chira (44) |
15 700 |
Peru |
9 800 |
62.23 |
| Ecuador |
5 800 |
37.23 |
| Chuy |
200 |
Brazil |
100 |
64.57 |
| Uruguay |
60 |
32.57 |
| Comau |
900 |
Chile |
900 |
91.36 |
| Argentina |
80 |
8.64 |
| Corantijn/Courantyne (45) |
41 800 |
Guyana |
21 700 |
52.06 |
| Suriname |
19 900 |
47.75 |
| Brazil |
80 |
0.19 |
| Cullen |
600 |
Chile |
500 |
83.00 |
| Argentina |
100 |
17.00 |
| Essequibo (46) |
239 500 |
Guyana |
162 100 |
67.67 |
| Venezuela |
52 400 |
21.87 |
| Suriname |
24 300 |
10.13 |
| Brazil |
200 |
0.07 |
| Gallegos-Chico |
11 600 |
Argentina |
7 000 |
60.15 |
| Chile |
4 600 |
39.85 |
| Jurado |
700 |
Colombia |
500 |
82.11 |
| Panama |
100 |
17.89 |
| La Plata (47, 48) |
2 954 500 |
Brazil |
1 379 300 |
46.69 |
| Argentina |
817 900 |
27.68 |
| Paraguay |
400 100 |
13.54 |
| Bolivia |
245 100 |
8.30 |
| Uruguay |
111 600 |
3.78 |
| Lagoon Mirim |
55 000 |
Uruguay |
31 200 |
56.69 |
| Brazil |
23 800 |
43.24 |
| Lake Fagnano (49) |
3 200 |
Argentina |
2 700 |
85.17 |
| Chile |
500 |
14.83 |
| Lake Titicaca-Poopo System |
111 800 |
Bolivia |
63 000 |
56.32 |
| Peru |
48 000 |
42.94 |
| Chile |
800 |
0.74 |
| Maroni (50) |
65 000 |
Suriname |
37 500 |
57.64 |
| French Guiana |
27 200 |
41.90 |
| Brazil |
200 |
0.27 |
| Mataje |
700 |
Ecuador |
500 |
73.98 |
| Colombia |
200 |
26.02 |
| Mira |
12 100 |
Colombia |
6 200 |
50.87 |
| Ecuador |
5 800 |
47.97 |
| Oiapoque/Oyupock |
23 300 |
French Guiana |
13 700 |
58.92 |
| Brazil |
9 500 |
41.00 |
| Orinoco |
927 400 |
Venezuela |
604 500 |
65.18 |
| Colombia |
321 700 |
34.68 |
| Brazil |
800 |
0.08 |
| Palena |
13 300 |
Chile |
7 300 |
54.87 |
| Argentina |
6 000 |
45.13 |
| Pascua |
13 700 |
Chile |
7 300 |
53.51 |
| Argentina |
6 400 |
46.46 |
| Patia |
21 300 |
Colombia |
20 800 |
97.61 |
| Ecuador |
500 |
2.38 |
| Puelo |
8 400 |
Argentina |
5 500 |
66.03 |
| Chile |
2 900 |
33.97 |
| Rio Grande (South America) |
8 000 |
Argentina |
4 000 |
49.74 |
| Chile |
4 000 |
50.26 |
| San Martin |
700 |
Chile |
600 |
87.44 |
| Argentina |
80 |
12.56 |
| Seno Union/Serrano |
6 500 |
Chile |
5 700 |
87.93 |
| Argentina |
700 |
10.34 |
| Tumbes-Poyango (44) |
5 000 |
Ecuador |
3 600 |
71.62 |
| Peru |
1 400 |
28.38 |
| Valdivia |
15 000 |
Chile |
14 700 |
98.39 |
| Argentina |
100 |
0.69 |
| Yelcho |
11 100 |
Argentina |
6 900 |
62.14 |
| Chile |
4 200 |
37.86 |
| Zapaleri (51) |
2 600 |
Chile |
1 600 |
59.60 |
| Argentina |
500 |
19.65 |
| Bolivia |
500 |
20.75 |
| Zarumilla (44) |
4 300 |
Ecuador |
3 400 |
78.71 |
| Peru |
900 |
20.51 |
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