Egypt is one of the most populous countries in Africa and the Middle East, and the 15th most populated in the world. The great majority of its over 84 million people live near the banks of the Nile River, an area of about 40,000 square kilometers (15,000 sq mi), where the only arable land is found. The large regions of the Sahara Desert, which constitute most of Egypt's territory, are sparsely inhabited. About half of Egypt's residents live in urban areas, with most spread across the densely populated centres of greater Cairo, Alexandria and other major cities in the Nile Delta.
Egypt has one of the longest histories of any modern state, having been continuously inhabited since the 10th millennium BC. Its monuments, such as the Giza pyramid complex and its Great Sphinx, were constructed by its ancient civilization, which was one of the most advanced of its time. Its ancient ruins, such as those of Memphis, Thebes, Karnak, and the Valley of the Kings outside Luxor, are a significant focus of archaeological study and popular interest. Egypt's rich cultural legacy, as well as the attraction of its Red Sea Riviera, have made tourism a vital part of the economy, employing about 12% of the country's workforce.