Natyashastra
नैरृत्यां राक्षसांश्चैव भूतानि च निवेशयत् । पश्चिमायां समुद्रांश्च वरुणं यादसां पतिम् ॥ २८॥
In the southwest, demons and spirits should be placed, and in the west, the oceans and Varuṇa, the lord of aquatic beings.
english translation
nairRtyAM rAkSasAMzcaiva bhUtAni ca nivezayat । pazcimAyAM samudrAMzca varuNaM yAdasAM patim ॥ 28॥
hk transliteration by Sanscript