Oasis

An oasis was a pool of water in the middle of a desert.
During Marco Polo's venture through the Gobi Desert, and after Tegana surreptitiously cut open the gourds containing their water supply, Polo and Ian Chesterton decided that the best course of action was to head for an oasis to the north. Polo warned that such places often had bandits nearby. (TV: Marco Polo)
A desert planet had at least one oasis on it, which the First Doctor, John and Gillian visited. (COMIC: Plague of the Black Scorpi)
The Andromedary was used on Bruvoldaveer to travel between oases. (COMIC: The Salt Solution)