Lake Tyrrell is a salt lake in northwestern Victoria, Australia. It lies in the Mallee lands, about 200 miles (320 kilometers) northwest of Melbourne and 40 miles (64 kilometers) west of Swan Hill. Lake Tyrrell is usually dry. A crust of salt covers the soft mud of its bed, which contains a mineral called gypsum. The town of Sea Lake, at the southern end of the lake, has a factory that extracts salt from the lake bed. Tyrrell Creek, a tributary of the Avoca, carries water to the lake from time to time. The English explorer Edward John Eyre explored the area in 1838 and named Lake Tyrrell and Tyrrell Creek for an early pioneer. See also Victoria.