| Country | Surface Area (Km2) | Total Area (Km2) | % of Kagera River Basin |
| Uganda | 241,000 | 5800 | 10 |
| Rwanda | 26,340 | 19,900 | 33 |
| Tanzania | 945,100 | 20,800 | 35 |
| Burundi | 27,834 | 13,300 | 22 |
| Total | 1,240,274 | 59,800 | 100 |