Lower Egypt, Arabic Miṣr Baḥr, geographic and cultural division of Egypt consisting primarily of the triangular Nile River delta region and bounded generally by the 30th parallel north in the south and by the Mediterranean Sea in the north. Lower Egypt is the northernmost region of Egypt, which consists of the fertile Nile Delta between Upper Egypt and the Mediterranean Sea, from El Aiyat, south of modern-day Cairo, and Dahshur.