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| Lake Name (short) | Lake Name (in full) | Country |
|---|---|---|
| Ibera | Ibera Lake | Argentina |
| Ibitinga | Ibitinga Reservoir | Brazil |
| Ihema | Lake Ihema | Rwanda |
| IJsselmeer | IJsselmeer | Netherlands |
| Ikeda | Lake Ikeda | Japan |
| Ilha Solteira Reservoir | Ilha Solteira Reservoir | Brazil |
| Iliamna | Iliamna Lake | USA |
| Ilmen | Lake Ilmen | Russia |
| Ilzas | Lake Geranimovas-Ilzas | Latvia |
| Imandrovskoye | Imandrovskoye Reservoir ( Imandra ) | Russia |
| Inari | Lake Inari | Finland |
| Inawashiro | Lake Inawashiro | Japan |
| Inba-numa | Inba-numa | Japan |
| Indawgyi Lake | Indawgyi Lake | Myanmar |
| Indir Sagar Reservoir | Indir Sagar Reservoir | India |
| Inle | Inle Lake | Myanmar |
| Island | Island Lake | Canada |
| Issyk-Kool | Lake Issyk-Kool | Kyrgyz |
| Istada | Lake Istada | Afghanistan |
| Itaipu Reservoir | Itaipu Reservoir | Brazil |
| Ivankovo Reservoir | Ivankovo Reservoir | Russia |
| Izabal | Lake Izabal | Guatemala |