Much of the red granite used for ancient temples and colossi came from quarries in the Aswan area. Around these quarries are many inscriptions, many of which describe successful quarrying projects. The unfinished obelisk is considered the largest piece of stone ever handled. Four boats were strapped together, and three obelisks were laid crosswise. The Egyptians then waited for the flooding waters to carry the boats away. Hatchepsut recorded that work on one of her obelisks took 7 months. It weighs about 1200 tons. When the obelisk was about to be finished, they found a flaw in the rock so they stopped the construction, and began in a new one.