gatvodicim disam raja
gatva—going; udicim—northern; disam—direction; raja—King Dhruva; rudra-anucara—by followers of Rudra, Lord Siva; sevitam—inhabited; dadarsa—saw; himavat—Himalayan; dronyam—in a valley; purim—a city; guhyaka—ghostly persons; sankulam—full of.
Dhruva Maharaja went to the northern direction of the Himalayan range. In a valley he saw a city full of ghostly persons who were followers of Lord Siva.
In this verse it is stated that the Yaksas are more or less devotees of Lord Siva. By this indication the Yaksas may be taken to be the Himalayan tribes like the Tibetans.
Link to this page: https://prabhupadabooks.com/sb/4/10/5