This is a dam across the river Karun, formed of cut stones, cemented by lime, and fastened together by clamps of iron; it is twenty feet broad, and no less than twelve hundred feet in length.

The whole is a solid mass excepting in the centre, where two small arches have been constructed for the purpose of allowing a part of the stream to flow in its natural bed.

The greater portion of the water is directed eastward into a canal cut for it; and the town of Shuster is thus defended on both sides by a water barrier, whereby the position becomes one of great strength.

Tradition says that Sapor used his power over Valerian to obtain Roman engineers for this work; and the great dam is still known as the Bund-i-Kaisar, or "dam of Caesar," to the inhabitants of the neighboring country.
Besides his works at Shahpur and Shuster, Sapor set up memorials of himself at Haji-abad, Nakhsh-i-Rajab, and Nakhsh-i-Rustam, near Persepolis, at Darabgerd in South-eastern Persia, and elsewhere; most of which still exist and have been described by various travellers.

At Nakhsh-i-Rustam Valerian is seen making his submission in one tablet, while another exhibits the glories of Sapor's court.