Lake Chilwa is the second-largest lake in Malawi after Lake Malawi. It is in eastern Zomba District, near the border with Mozambique. Approximately 60 km long and 40 km wide, the lake is surrounded by extensive wetlands. There is a large island in the middle of the lake called Chisi Island. The lake has no outlet, and is at risk for drying up if the water in its catchment is diverted for human use. The Danish International Development Agency has been working to ensure preservation of the lake and its wetlands.