section_path: Geography/Hydrography
section_name: Hydrography
paragraph_text: Hydrography
  
  The drainage basin of the Mediterranean Sea is particularly heterogeneous and extends much further than the Mediterranean region. Its size has been estimated between 4,000,000 and 5,500,000 km (1,500,000 and 2,100,000 sq mi), depending on whether non-active parts (deserts) are included or not. The longest river ending in the Mediterranean Sea is the Nile, which takes its sources in equatorial Africa. The basin of the Nile constitutes about two-thirds of the Mediterranean drainage basin and encompasses areas as high as the Ruwenzori Mountains. Among other important rivers in Africa, are the Moulouya and the Chelif, both on the north side of the Atlas Mountains. In Asia, are the Ceyhan and Seyhan, both on the south side of the Taurus Mountains. In Europe, the largest basins are those of the Rhône, Ebro, Po, and Maritsa. The basin of the Rhône is the largest and extends up as far north as the Jura Mountains, encompassing areas even on the north side of the Alps. The basins of the Ebro, Po, and Maritsa, are respectively south of the Pyrenees, Alps, and Balkan Mountains, which are the major ranges bordering Southern Europe.
  
  Total annual precipitation is significantly higher on the European part of the Mediterranean basin, especially near the Alps (the 'water tower of Europe') and other high mountain ranges. As a consequence, the river discharges of the Rhône and Po are similar to that of the Nile, despite the latter having a much larger basin. These are the only three rivers with an average discharge of over 1,000 m /s (35,000 cu ft/s). Among large natural fresh bodies of water are Lake Victoria (Nile basin), Lake Geneva (Rhône), and the Italian Lakes (Po). While the Mediterranean watershed is bordered by other river basins in Europe, it is essentially bordered by endorheic basins or deserts elsewhere.
  
  The following countries are in the Mediterranean drainage basin while not having a coastline on the Mediterranean Sea: