Melleņu meža vidū esošais Velnezers ir viens no dzidrākajiem Latvijas ezeriem, kas piesaista ar savu savdabīgo zilganzaļo ūdens krāsu, lielo ūdens caurredzamību un dīvainajiem nostāstiem, kas to apvijuši kopš sendienām. Piltuvveida ieplakā izvietotā Velnezera dziļums sasniedz 17 metrus, bet ūdens caurredzamība vietām pat 12 metrus.
No river or spring flows in or out of this lake. Neither bulrushes nor water lilies grow there. Birds and wild animals avoid it as well. People say that there are many snakes on the lakeshores, but fish arecaught very rarely, except for fat perch. There is one story that says Velnezers Lake appeared as a result of a fallen space object.
