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 //

Ca, Sū., 13, 91.1 grāmyānūpaudakaṃ māṃsaṃ guḍaṃ dadhi payastilān /

ViPur, 1, 6, 18.1 tato durgāṇi tāś cakrur vārkṣaṃ pārvatam audakam /