The Nile Valley through northern Sudan traces its origins to the ancient civilizations of Egypt and Kush. The Egyptians over the centuries have shifted their language from Egyptian to modern Egyptian Arabic, while retaining a sense of national identity that has historically set them apart from other people in the region. Most Egyptians are Sunni Muslim and a significant minority adheres to Coptic Christianity. In Nubia, straddling Egypt and Sudan, a significant population retains the ancient Nubian language but has adopted Islam. The northern part of the Sudan is home to a largely Arab Muslim population, but further down the Nile Valley, the largely non-Muslim Nilotic and Nuba peoples begin.