Vishnupurana 2.2.55

In the country of Bhadráśwa, Vishńu resides as Hayasírá (the horse-headed); in Ketumála, as Varáha (the boar); in Bhárata, as the tortoise (Kúrma); in Kuru, as the fish (Matsya); in his universal form, every where; for Hari pervades all places: he, Maitreya, is the supporter of all things; he is all things. In the eight realms of Kimpurusha and the rest (or all exclusive of Bhárata) there is no sorrow, nor weariness, nor anxiety, nor hunger, nor apprehension; their inhabitants are exempt from all infirmity and pain, and live in uninterrupted enjoyment for ten or twelve thousand years. Indra never sends rain upon them, for the earth abounds with water. In those places there is no distinction of Krita, Treta, or any succession of ages. In each of these Varshas there are respectively seven principal ranges of mountains, from which, oh best of Brahmans, hundreds of rivers take their rise.

In the country of Bhadráśwa, Vishńu resides as Hayasírá (the horse-headed); in Ketumála, as Varáha (the boar); in Bhárata, as the tortoise (Kúrma); in Kuru, as the fish (Matsya); in his universal form, every where; for Hari pervades all places: he, Maitreya, is the supporter of all things; he is all things. In the eight realms of Kimpurusha and the rest (or all exclusive of Bhárata) there is no sorrow, nor weariness, nor anxiety, nor hunger, nor apprehension; their inhabitants are exempt from all infirmity and pain, and live in uninterrupted enjoyment for ten or twelve thousand years. Indra never sends rain upon them, for the earth abounds with water. In those places there is no distinction of Krita, Treta, or any succession of ages. In each of these Varshas there are respectively seven principal ranges of mountains, from which, oh best of Brahmans, hundreds of rivers take their rise.