Lake Feneketlen
| Lake Feneketlen  Feneketlen-tó  | |
|---|---|
| Location | Budapest | 
| Coordinates | 47°28′36″N 19°2′29″E / 47.47667°N 19.04139°E | 
| Basin countries | Hungary | 
| Max. length | approx. 200 m (660 ft) | 
| Max. width | approx. 40 m (130 ft) | 
| Surface area | approx. 10,000 m2 (110,000 sq ft) | 
| Max. depth | 4–5 m (13–16 ft) | 
| Settlements | Budapest | 
Lake Feneketlen (Feneketlen-tó, "Bottomless Lake") is a pond in the 11th district of Budapest, Hungary.
The lake was formed in 1877, when clay was removed from the site to supply a brick factory that was situated at nearby Kosztolányi Dezső tér. The lake's water quality in the 1980s began to deteriorate, until a water circulation device was built. The fishing is forbidden on this lake.