The Egyptian pyramid fields between Giza and Lisht, built over a nearly 1,000-year period starting approximately 4,700 years ago, now sit on the edge of the inhospitable Western Desert, part of the Sahara. Sedimentary evidence suggests that the Nile used to have a much higher discharge, with the river splitting into several branches in places. Researchers have previously speculated that one of these branches may have flown by the pyramid fields, but this has not been confirmed.
Comment: Note that there's compelling evidence that suggests the Giza pyramids were built thousands of years earlier than is commonly believed, and that they likely were served a technological function, rather than being a funerary monument to a pharaoh. However, could it be that this flow of water may have played some part in its operation?
Comment: See also: