Valmiki Ramayana Kishkindha Kanda Sarga 43 Shloka 29

अवृक्षम् without trees, विहगालयम् abode of birds, मानसम् Manasa, कामशैलम् mountain Kama, तत्र there, भूतानाम् for all living beings, गतिः access, न not, देवदानव gods, demons, रक्षसां च rakshas, न not.

'There is a mountain region known as Kama, and Manasa where there are no trees. It is a bird sanctuary. Not only living beings, even gods, demons and rakshas have no access to that place.