Mouila is the capital of the Ngounié region of Gabon. It lies on the Ngounié River and the N1 road and has a population of about 20,000 people. Its main sight is Lac Bleu, a lake known for its bright blue water. Mouila is very spread out and has several markets and commercial centers. A taxi service runs in Mouila. Taxis are green and white and cost 200–500 Central African CFA francs depending on the distance traveled.