The Vayu-Kshetra Book Analysis

The very first elaborate account of the holy city of Gaya (then Gaya-kshetra) is in the concluding section of the Vayu-Purana (Hindu Religious text, dedicated to the wind God, Vayu), which comprises a total of eight chapters (Source : Barua, Benimadhat; Gaya and Buddha Gaya, Volume -1, 2014). In the Vayu-purana, “Brahma is said to have declared that the entire tract of Gaya was 5 krosas (a distance of two miles) [2] in extent; that Gaya proper representing the inner zone of the tract of Gaya was 2 and half krosas in extent; and that Gayasira determining the extension of the ancient town of Gaya and representing the innermost zone of the tract of Gaya was 1 krosa in extent.”

Benimadhat Barua in Gaya and Buddha Gaya, Volume – 1, 2014, mentions,
Endowed with mighty strength, he was 126 leagues (yojanas) in height and 60 leagues in girth (Source: Barua, Benimadhat; Gaya and Buddha Gaya, Volume -1, 2014).
Barua mentions when Gayasura remained stationary on the noble hill of Kolahala for thousands of years, stopping his breathing and performing other rigorous exercises, the Gods in fear of losing their blissful existence, sought the help of Brahma, the great father of the Universe. Lord Brahma finding himself incapable, led the Gods to Siva, who in turn led them to Vishnu. Lord Vishnu finally dissuaded the giant by granting him what he wished. “Say, Gayasura, what do you wish?" The giant said: "If you are really satisfied with me, render my body purer than all that is and may be conceived as pure' "Even so be
The heaven of 33 gods became empty and the domains of Lord Indra (Lord of Swargalok, or the heavens) and Lord Yama (Lord of Pitras, or the dead) were deprived of their inhabitants. As a last resort, Lord Vishnu was asked for help and the giant was asked to offer his holy body for the performance of a sacrifice. “The giant agreeing to offer his body, fell prostrate on the Kolahala hill, leaning towards the south-west, with his head testing on the north side and his feet extended towards the south.” However, the body of Gayasura was still moving, and Brahma ordered Yama to fetch Dharamsila, or the Stone of Virtue from Yamlok, his abode and, forthwith was placed on the giant’s head and all the gods sat upon it. But, even after being pressed down, Gayasura was still moving. “Vishnu who was again approached by the gods drew forth from his person a terrible form, the form of the wielder of the mace (gadddham), and sat upon the Stone to prevent its moving. It is by striking the Stone with his mace that Vishnu at last succeeded in rendering the giant's body completely