Tura, Egypt

Tura (Egyptian Arabic: طرة Tora  IPA: [ˈtˤoɾˤɑ], Coptic: ⲧⲣⲱⲁ, Ancient Greek: Τρωια or Τρωη) was the primary quarry for limestone in ancient Egypt. The site, which was known by the ancient Egyptians as Troyu or Royu, is located about halfway between modern-day Cairo and Helwan. Its ancient Egyptian name was misinterpreted by the ancient Greek geographer Strabo, who thought it meant it was inhabited by Trojans, thus the Hellenistic city was named Troia. The site is located by the modern town of Tora in the Cairo Governorate.

The limestone from the quarry is thought to be part of the Mokattam Formation, which was deposited during the late Lutetian stage of the Eocene epoch, about 42 million years. Some fossil fish species have been described from the quarry.