Wadi Tumilat is the 50-kilometre-long (31 mi) dry river valley (wadi) to the east of the Nile Delta. In prehistory, it was a distributary of the Nile. It starts near the modern town of Zagazig and the ancient town of Bubastis and goes east to the area of modern Ismaïlia.

The Nile Delta is the delta formed in Lower Egypt where the Nile River spreads out and drains into the Mediterranean Sea. It is one of the world's larger deltas—from Alexandria in the west to Port Said in the east, it covers 240 km (150 mi) of Mediterranean coastline and is a rich agricultural region. From north to south the delta is approximately 160 km (100 mi) in length. The Delta begins slightly down-river from Cairo.