Amur Oblast is located in the southeast of Russia, between the
Stanovoy Range in the north and the
Amur River in the south, and borders with the
Sakha Republic in the north,
Khabarovsk Krai and the
Jewish Autonomous Oblast in the east,
Heilongjiang of China in the south, and with
Zabaykalsky Krai in the west. The
Stanovoy Range forms the dividing line between the Sakha Republic and Amur Oblast and spreads across the oblast's entire northern border. The
Amur–Zeya and
Zeya–Bureya Plains cover about 40% of the oblast's territory, but the rest is hilly. Several mountain ranges rise to the south of the Stanovoy Range, including the
Selemdzha Range parallel to it, as well as the
Ezop,
Yam-Alin and the
Turan ranges stretching along the oblast's southeastern border with Khabarovsk Krai. Many rivers flow through the oblast, especially in the north, accounting for 75% of the
hydropower resources in the
Russian Far East. Most of the oblast is in the Amur's
drainage basin, although the rivers in the northwest drain into the
Lena and the rivers in the northeast drain into the
Uda. The longest rivers include the Amur,
Bureya,
Gilyuy,
Nyukzha,
Olyokma,
Selemdzha, and
Zeya. The Zeya begins in the mountains in the northeast, and its middle reaches are dammed to create the huge
Zeya Reservoir, which sprawls over . Climate is temperate continental, with cold, dry winters and hot, rainy summers. Average January temperatures vary from in the south to in the north. Average July temperatures are in the south and in the north. Annual
precipitation is about . Dwarf Siberian pine and
alpine tundra grow at higher elevations and
larch forests with small stands of flat-leaved
birch and
pine forests grow alongside the river plains. These larch and
fir-
spruce forests form the watershed of the Selemdzha River. The Bureya and Arkhara Rivers, southeast of the Selemdza, have the richest remaining forests in the oblast with
Korean pine,
Schisandra chinensis,
Mongolian Oak, and other Manchurian flora. The Zeya–Bureya Plain, located between the Zeya, Amur, and Bureya Rivers, has the highest biodiversity in Amur Oblast. Much of this plain has been burned for agriculture, but large patches still remain. Japanese Daurian and Far Eastern western cranes nest here, as well as a host of other rare birds.
Natural resources Amur Oblast has considerable reserves of many types of mineral resources; proven reserves are estimated to be worth US$400 billion. Among the most important are gold (the largest reserves in Russia), silver,
titanium,
molybdenum,
tungsten, copper, and
tin. There are also an estimated 70 billion tons of
bituminous coal and
lignite reserves. Probable iron deposits are estimated to be 3.8 billion tons. The Garin deposit is fully explored and known to contain 389 million tons of iron ore. Estimated reserves of the deposit are 1,293 million tons. The deposit's ore contains a low concentration of detrimental impurities; the ore contains 69.9% iron. Amur Oblast is also a promising source of
titanium, with the Bolshoy Seyim deposit being the most important. ==History==