One of the earliest Neolithic sites in the Indian subcontinent is Bhirrana along the ancient Ghaggar-Hakra (Saraswati) riverine system in the present day state of Haryana in India, dating to around 7600 BC. Other early sites include Lahuradewa in the Middle Ganges region and Jhusi near the confluence of Ganges and Yamuna rivers, both dating to around 7000 BC. The aceramic Neolithic at Mehrgarh lasts from 7000 to 5500 BC, with the ceramic Neolithic at Mehrgarh lasting up to 3300 BC; blending into the Early Bronze Age. Mehrgarh is one of the earliest sites with evidence of farming and herding in the Indian subcontinent. Early Mehrgarh residents lived in mud brick houses, stored their grain in granaries, fashioned tools with local copper ore, and lined their large basket containers with bitumen. They cultivated six-row barley, einkorn and emmer wheat, jujubes and dates, and herded sheep, goats and cattle. Residents of the later period (5500 BC to 2600 BC) put much effort into crafts, including flint knapping, tanning, bead production, and metal working. The site was occupied continuously until about 2600 BC. The Indus Valley Civilization (c. 3300–1700 BC, flourished 2600–1900 BC), abbreviated IVC, was an ancient civilization that flourished in the Indus and Ghaggar-Hakra river valleys have been found in eastern Afghanistan, Pakistan and western India. Minor scattered sites have been found as far away as Turkmenistan. Another name for this civilization is the Harappan Civilization, after the first of its cities to be excavated, Harappa in the Pakistani province of Punjab. The IVC were known to the Sumerians as the Meluhha, and other trade contacts may have included Egypt, Africa, however, the modern world discovered it only in the 1920s as a result of archaeological excavations and rail-road building.