Natyashastra
सर्वे नागाश्च निषधे शेषवासुकितक्षकाः । महामेरौ त्रयस्त्रिंशद् ज्ञेया देवगणा बुधैः ॥ ३०॥
All the Nagas, including Shesha, Vasuki, and Takshaka, are known to reside in the Nishadha. The three main divine groups to be recognized by the wise are the gods associated with Mount Meru.
english translation
sarve nAgAzca niSadhe zeSavAsukitakSakAH । mahAmerau trayastriMzad jJeyA devagaNA budhaiH ॥ 30॥
hk transliteration by Sanscript