ArthaŚ, 2, 3, 1.1 caturdiśaṃ janapadānte sāmparāyikaṃ daivakṛtaṃ durgaṃ kārayet antardvīpaṃ sthalaṃ vā nimnāvaruddham audakam prāstaraṃ guhāṃ vā pārvatam nirudakastambam iriṇaṃ vā dhānvanam khañjanodakaṃ stambagahanaṃ vā vanadurgam //