It is difficult to travel through the huge expanse of parched sands in the Sahara Desert, where oases are plentiful but distant from each other.

Question

Which phrase is the adverb clause?

Answer 1

I see an adjective clause, but not an adverb clause.

http://www.chompchomp.com/terms/adverbclause.htm

http://www.chompchomp.com/terms/adjectiveclause.htm