Matsya Purana 217.16

217.16

gajānāṃ prāṅmukhī śālā kartavyā vāpyudaṅmukhī.
āgneye ca tathā bhāge āyudhāgāramiṣyate .. 217.16 ..

The palace on the banks of a river should be of the shape of a crescent, this is the best Treasure should be kept in the southern portion of the palace, to the further south of which should be the place for the elephants The elephantyard should have its doorway to the east or the north The arsenal should be made south east—14-16