Chadwick Lakes, also known as Wied il-Qliegħa, is the longest valley found on the island of Malta. It is located in the limits of Mtarfa. This valley consists of a number of dams constructed by Sir Osbert Chadwick, a British Engineer, in the late 19th Century. The valley consists of a complex system of well-planned small dams, draining into Wied Speranza and ending at Salina Bay into the sea. The valley provides farmers with water to irrigate their land. Wied il-Qliegħa is only full during the winter months. Wied il-Qliegħa is Malta's only freshwater stream big enough to be called a rivulet, providing a tranquil environment for the people to enjoy.