The coastline of Liaoning Province is 2,178 kilometers long - nearly 12 percent of China's total. The hilly regions in east Liaoning are the main area for forest. Adjoining the long, narrow costal plains (usually called the Liaoxi Corridor) is the main road for Northeast China, linking with North China. Liaohe Plain in Central Liaoning, as a part of the Northeastern China Plain, has sedimentary deposits from the Liaohe River and other tributaries. The plain has abundant water and fertile soil, and is the main farming area and commodity grain base in Liaoning Province.