Abéché is a city in Chad and the capital of the Ouaddaï Region. It is one of the largest cities in the country and has within it the remnants of the a…Abéché is a city in Chad and the capital of the Ouaddaï Region. It is one of the largest cities in the country and has within it the remnants of the ancient capital, including palaces, mosques, and the tombs of former sultans.