In which you'll find this range of mountains? (5)
I believe the answer is:
atlas
This could be a double definition.
'in which you'll find this range' is the first definition.
'atlas' can be an answer for 'range' (I've seen this before). I'm unsure of the remainder of the definition.
'mountains?' is the second definition.
(I've seen this before)
'of' acts as a link.
Can you help me to learn more?
(Other definitions for atlas that I've seen before include "Book of maps or charts" , "N. African mountains; a Titan" , "Set of charts" , "Album of maps" , "Sky carrier - map book" .)