Lake Alexander is a man-made lake named in honour of Alec Fong Lim who was Lord Mayor of Darwin from 1984 to 1990. The lake is located in Fannie Bay Darwin, Northern Territory, Australia and was officially opened on the 21 July 1991 for recreational use by the people of Darwin. The water in the lake is refreshed with pumps bringing water from the adjoining harbour through filters intended to prevent marine organisms from entering. This system has succeeded in keeping large predators such as crocodiles and buyll sharks, and the locally abundant box and irukanji jelly fish.