Question

I am looking for the adverb clause in this sentence: It is difficult to travel through the huge expanse of parched sands in the Sahara Desert, where oases are plentiful but distance from each other.

Answer 1

Adverbs tell where, when, how, etc. What clause in there tells you one of those things?

Answer 2

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.

Which phrase is the adverb clause?