Mbh 5.111.2a

“‘“It is in this region, O foremost of Brahmanas, that those illustrious and truth-speaking Munis called by the name of Dharma, guard the source of the Ganges. The origin and physical features and ascetic penances of these Munis are not known to all. The thousand dishes they use for serving the food offered in hospitality and the edibles also they create at will, are all a mystery. The man, O Galava, that passeth beyond the point guarded by these Munis, is certain, O foremost of Brahmanas, to meet with destruction. None else, O bull among Brahmanas, save the divine Narayana, and the eternal Nara called also Jishnu, succeeded in passing beyond the point so guarded. It is in this region that the mountains of Kailasa lie, the abode of Ailavila (Kuvera). It is here that the ten Apsaras known by the name of Vidyutprabha had their origin. In covering, O Brahmana, the three worlds with three steps in the sacrifice of Vali (the Asura king), Vishnu had covered this whole northern region; and, accordingly, there is a spot here called Vishnupada. And it is so called after the footprint of Vishnu caused on that occasion. Here, in this quarter, at a place called Usiravija, by the side of the golden lake, king Marutta performed, O foremost of Brahmanas, a sacrifice. It is here that the brilliant and shining gold mines of Himavat exhibit themselves to the illustrious and regenerate Rishi Jimuta. And Jimuta gave away the whole of that wealth to the Brahmanas. And having given it away, that great Rishi solicited them to call it after his own name. And hence that wealth is known by the name of the Jaimuta gold. Here, in this region, O bull among Bharatas, the regents of the worlds, O Galava, every morning and evening, proclaim, ‘What business of what person shall we do?’ It is for these, O foremost of Brahmanas, and other incidents, that the northern region is superior to all quarters. And because this region is superior (uttara) to all, therefore, it is called the north (uttara).