Canopus, also known as Canobus, was an ancient Egyptian coastal town, located in the Nile Delta. Its site is in the eastern outskirts of modern-day Alexandria, around 25 kilometers (16 mi) from the center of that city. Canopus was located on the western bank at the mouth of the westernmost branch of the Delta – known as the Canopic or Heracleotic branch. It belonged to the seventh Egyptian Nome, known as Menelaites, and later as Canopites, after it. It was the principal port in Egypt for Greek trade before the foundation of Alexandria, along with Naucratis and Heracleion. Its ruins lie near the present Egyptian town of Abu Qir.

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.