Isaiah 15:5-6. “My heart shall cry out for Moab; his fugitives shall flee unto Zoar, an heifer of three years old: for by the mounting up of Luhith with weeping shall they go it up: for in the way of Horonaim they shall raise up a cry of destruction. For the waters of Nimrim shall be desolate: for the hay is withered away, the grass faileth, and there is no green thing.”
Isaiah himself would see the destruction of Moab, and would mourn. The fugitives who escaped death would seek refuge south and west of their home. Zoar is compared to a three-year-old ox, an age at which the animal will be at his full strength. Zoar, then, becomes an important city of refuge for the Moabites.
Luhith was a rise about one mile west of Mount Nebo, where sacrifice was made to the gods of the Moabites. The waters of Nimrim are just south of Luhith. Horonaim remains unidentified for certain, but some believe it to have been a city north of Kirhareseth.
The thing all these places share in common is the desolation of war. Water is dried up, the hay and grass are withered, or dried up and useless. There is nothing green. The desolation and destruction are complete.