(2) the terrain of the northeast region to the plains, hills and mountains are mainly, mountains around the water around, the fertile land is a vivid depiction of the topography of the northeast region, the surface structure is roughly semi-annular three zones: the periphery is the Heilongjiang River, the Ussuri River, the Tumen River and Yalujiang River basin lowlands, in the middle of the mountains and hills, the land is roughly half-annular three zones: the periphery is the Heilongjiang River, the Ussuri River, the Tumen River and Yalujiang River, and so on. Basin lowlands, the middle of the mountains and hills, the interior is a vast plain; the three northeastern provinces of Heilongjiang Province (the capital city is Harbin), Jilin Province (the capital city of Changchun) and Liaoning Province (the capital city of Shenyang);
(3) China's northeastern region for the temperate monsoon climate, high temperatures in summer rain, rain and heat at the same time, and therefore by the impact of the rain and heat of the same time the influence of climatic characteristics of the climate can also be planted in the rice;
(4) The "Northern Great Barrens" are located in the eastern part of Heilongjiang Province, neighboring Russia. Among them, the Sanjiang Plain is listed on the International Wetland Conservation List because of its long rivers, swamps and dense forests. Since the founding of the country, after decades of development, this is everywhere a good field of fertile land, road and road. Has become an important national grain, soybean production base. 2000, the Chinese government decided to stop the "Great Northern Wilderness" reclamation, in order to protect the existing millions of hectares of wetlands. The key protection areas required as soon as possible to return to the forest, grass, wetlands;
(5) the northeast region is rich in mineral resources, land and water transportation is convenient, heavy industry is developed, of which the Liaozhongnan industrial base is China's largest heavy industrial base.
The answer is: (1) Daxinganling; Changbai Mountain; Northeast - Southwest; (2) mountains around the water, fertile land;
(3) high temperature in summer, rain and heat at the same time; (4) the protection of the "wetlands", to improve the ecological environment; (5) heavy industry; rich in mineral resources, convenient land and water transportation.