In South Africa I make mistake identifying range of mountains (6)
I believe the answer is:
sierra
'range of mountains' is the definition.
(sierra is a kind of range of mountains)
'in south africa i make mistake' is the wordplay.
'in' indicates putting letters inside.
'south africa' becomes 'SA' (abbreviation).
'make mistake' becomes 'err' (to err is to make an error).
'i'+'err'='ierr'
'sa' enclosing 'ierr' is 'SIERRA'.
'identifying' is the link.
(Other definitions for sierra that I've seen before include "Range of mountains with jagged peaks" , "A range of mountains in Spain" , "Mountain chain, S (radio comms.)" , "Spanish range of mountains" , "Spanish word for a mountain" .)