Ivory

Ivory is the Tusk of an Elephant. In the Ancient World it was transported from Africa along the Nile through Egypt.
The Ivory was stored in warehouses on Elephantine Island at the southern Border of Egypt.

Elephantine Island is located in the river Nile opposite Aswan, Egypt.
It was located near the First Cataract of the Nile, and with Philae Island, were the first to record the Annual Rise of the Nile.
The Ancient Egyptians maintained a Garrison at Elephantine, as this marked the southern Border of Egypt.
It was also used as a warehouse for the Ivory trade that came down the Nile from Africa.
The name Elephantine Island is possibly derived from the storage of elephant tusks here.

Elephantine Island, Aswan, Egypt