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Lake Ewlyamartup is an ephemeral salt lake located approximately 17 km (11 mi) east of the town of Katanning and about 294 km (183 mi) south-east of Perth. The lake has a catchment area of 50,700 ha (125,000 acres) with an average rainfall of 478 mm (18.8 in) per annum and an evaporation rate of 1,826 mm (71.9 in) per annum.