| Fjallavatn | |
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| Location | Vágar |
| Coordinates | 62°07′21″N 7°17′57″W / 62.12250°N 7.29917°WCoordinates: 62°07′21″N 7°17′57″W / 62.12250°N 7.29917°W |
| Basin countries | Faroe Islands |
| Surface area | 1.02 km2 (0.39 sq mi) |
Fjallavatn is the second largest lake in the Faroe Islands. It is situated on the island of Vágar and its size is 1 km2.