The Whroo Dam is a large shire dam, situated about 10km west of Ultima and 29km east of Sea Lake on the Sea Lake Road. It was two or three times bigger than the usual dams, which were in place to enable people to water their stock, and for travellers to do likewise, because in the early days of settlement travellers moved about on horseback, in a gig, buggy or wagon, and needed access to water for their animals.