What is "jerwan"

Jerwan is a locality north of Mosul in the Nineveh Province of Iraq. The site is clear of vegetation and is sparsely settled.

The site is famous for the ruins of an enormous aqueduct crossing the Khenis River, constructed of more than two million dressed stones and using stone arches and waterproof cement. Some consider it to be the world's oldest aqueduct, predating anything the Romans built by five centuries.