Shiva Purana
द्विगुणेन कुशद्वीपः समंताद्बाह्यतः स्थितः ॥ वसंति तत्र दैतेया मनुजैस्सह दानवाः ॥ ३९ ॥
The island of Kusha is situated outside on all sides by twice as much The giants and demons live there along with humans.
english translation
dviguNena kuzadvIpaH samaMtAdbAhyataH sthitaH ॥ vasaMti tatra daiteyA manujaissaha dAnavAH ॥ 39 ॥
hk transliteration by Sanscript