There are a number of systems of transportation in the Comoros. The Comoros possesses 880 km (547 mi) of road, of which 673 km (418 mi) are paved. It has three seaports: Fomboni, Moroni and Moutsamoudou, but does not have a merchant marine, and no longer has any railway network. There are no trains or buses in the Comoros, as most locals and tourists rely on rental cars and taxis for transport. Four-wheel drive vehicles are recommended when visiting outlying islands, especially during rainy seasons. More frequently traveled roads are tarred and generally in good condition.