Sea and water cargo transportation have vital importance for Azerbaijan, especially in regions where road and rail connections are disputed. Azerbaijan has direct maritime connections only with other Caspian littoral states (Iran, Kazakhstan, Russia, and Turkmenistan). However, the Volga-Don Canal provides maritime access to the high seas. The main activity is transport of cargo, mainly of oil and oil products. Shipping regions are Caspian, Black, Mediterranean and Marmara Seas. The main shipping company owes 72 ships, 37 of which are tankers (including 1 water-carrier).