Heart of naturalist is in the mountains! (4)

I believe the answer is:

ural

'the mountains' is the definition.
(the Ural Mountains)

'heart of naturalist is' is the wordplay.
'heart of' indicates a hidden word.
'URAL' is hidden in the letters of 'naturalist is'.

'in' acts as a link.

(Other definitions for ural that I've seen before include "Russian river flowing into the Caspian Sea" , "Mountains in Russia" , "River of central Russia" , "Russian river giving name to mountains" , "Mountain range between Europe and Asia" .)

I've seen this clue in the Sydney Morning Herald.

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