| Lake Aheru | |
| Pushpin Map: | Estonia |
| Location: | Taheva Parish, Valga County, Estonia |
| Coords: | 57.6917°N 47°W |
| Basin Countries: | Estonia |
| Length: | 2600m (8,500feet) |
| Width: | 1850m (6,070feet) |
| Area: | 234ha |
| Depth: | 3.4m (11.2feet) |
| Max-Depth: | 7.4m (24.3feet) |
| Volume: | 7956000m2 |
| Elevation: | 69.3m (227.4feet) |
Lake Aheru is a lake of Estonia. With an area of 234 ha, Lake Aheru is the largest of the Karelian lakes, situated 69.3 m above sea level. It has a maximum depth of 7.4 m and an average depth of 3.4 m.