Tasik Timah-Tasoh, built in 1992 with a cost of RM67 million, supplies water to Perlis folks as well as prevents any occurrence of flood in the state. The lake can hold about 35.3 million litres of water at any one time.

The scenic Timah-Tasoh Lake is also a sanctuary for migratory birds especially from the cold countries as this freshwater lake with its natural surroundings provides much needed food and shelter for these birds.

Located within the Perlis State Park, this lake has also been identified as a suitable site for fish breeding and other aquaculture projects.