Sentence:  It was the Lost Oasis, the Oasis of the vision in the <WSD>sand</WSD>. […] Deep-hidden in the hollow, beneath the cliffs, it lay; and round it the happy verdure spread for many a rood. ... Yes, the quest was ended, the Lost Oasis was the Found! 
Meaning of the word marked with <WSD> tags:  A beach or other expanse of sand.