'Deserts' in the Bible

Then Moses ascended from the deserts of Moab to Mount Nebo, to the summit of Pisgah, which is opposite Jericho. The Lord showed him the whole land -- Gilead to Dan,

The Israelites mourned for Moses in the deserts of Moab for thirty days; then the days of mourning for Moses ended.

Some men from Manasseh joined David when he went with the Philistines to fight against Saul. (But in the end they did not help the Philistines because, after taking counsel, the Philistine lords sent David away, saying: "It would be disastrous for us if he deserts to his master Saul.")