Śrīpura-Nirmāṇa-Prastāva (Inquiry into Śrīpura and its Construction) / “The Proposal to Build Śrīpura”
तस्माद्गोपुरमूलस्य वेष्टो विंशतियोजनः / उपर्युपरि वेष्टस्य ह्रास एव प्रकीर्त्यते
tasmādgopuramūlasya veṣṭo viṃśatiyojanaḥ / uparyupari veṣṭasya hrāsa eva prakīrtyate
Therefore, from the base of the gopura, the enclosing circuit extends for twenty yojanas; and as the enclosure rises higher and higher, its measure is said to diminish.