How big were Egyptian nomes?

The nomes of Upper Egypt had indefinite area, since they only had boundaries along the Nile river, not on the land each side. The longest of these was the 1st nome ("Land of the Bow"), extending for more than 50 miles along the river.

In Lower Egypt (around the Nile delta), nomes were historically bounded by the many different tributaries and branches of the Nile as it spread out; the courses of these branches have all moved since ancient times so our understanding of the size of each nome is far from certain. Perhaps the largest was the 3rd nome of Lower Egypt ("Horus of the West"), which had an area of about 1,080 square miles.