According to Imam Jafar’e-Sadiq (a.s.)
While on hill or on great height
In another tradition he has stated that if a person on the top of great heights recites:
Transliteration: LA ILAHA-ILLAL-LAHO VALLAHO AKBER
There is no Creator except Allah and He is Almighty.
Then all the things till the very low end of the earth will recite the same Kalma.
