Many imported products come through the ports of Nouakchott or Nouadhibou. The roadway network is 10 300 km long, of which 2424 km are tarred, 872 km are made of improved earth and 7001 km are trails. The network is dangerous, especially during nights and due to many wandering animals, absence of lighting and heavy-weight trucks parked on fire lanes. River way transportation is possible of the Senegal river. Concerning railroads, they serve the north of the country and are used essentially to convoy the extracted minerals from the different northern mines.