Answer:
Seas in Europe: the most important sea is the Mediterranean, which marks the southern border with Africa, and the southeastern border with Asia. Other important seas are the Black Sea, the Caspian sea, the Baltic Sea, the North Sea, and the Norwegian Sea.
Rivers in Europe: the most important are: the Danube, the Rhin, the Volga, the Dnieper, the Don, the Vistula, the Elbe, the Loire, the Seine, the Po, and the Duero.
Mountains in Europe: the highest mountain range is the Alps, in the center of the continent. Other important ranges are: the Pyrenees, the Urals (which mark the border with Asia), the Balkan Mountains, and the Carpathian Mountains.
Oil and Gas Reserves in Europe: most of the European continent is devoid of Oil and Gas Reserves. However, there are two regions with important oil and gas reserves: the North Sea, shared by Norway and the United Kingdom, and the southern Caspian Sea, shared by Russian and Azerbaijan. Other Regions of European Russia are also rich in oil and gas reserves.