improve policy coordination and integration. The region has experienced difficulty distancing itself from a planned economy, a legacy that began in 1905 with the establishment of the Japanese sphere of influence there. The region's once-abundant raw materials have also depleted and the economy has suffered from bureaucratic inefficiency and protectionist politics. The region is, on the whole, more heavily urbanised than most parts of China, largely because it was the first part of the country to develop heavy industry owing to its abundant coal reserves. Major cities include Shenyang, Dalian, Harbin, Changchun and Anshan, all with several million inhabitants. Other cities include the steel making centres of Fushun and Anshan in Liaoning, Jilin City in Jilin, and Qiqihar and Mudanjiang in Heilongjiang. Harbin, more than any other city in China, possesses significant Russian influences: there are many Orthodox churches that have fallen out of use since the Cultural Revolution. Shenyang and Dalian, meanwhile, have sizable populations of Japanese and South Koreans due to their traditional linkages. The rural population of the Northeast is heavily concentrated in the warmer southern part of the area, where very warm to hot summer weather permits crops such as maize and millet to be grown with high yields. Soybeans and flax are also very important, as are wheat and barley. The region possesses large flocks of sheep, and pigs are abundant in the more densely settled southern part. The northern half of Heilongjiang is so cold and poorly drained that agriculture is almost impossible; however, the Amur River provides very rich fishing prospects, and sheep are even more abundant than in southern Heilongjiang. Northeast China is the country's traditional industrial base, focusing mainly on equipment manufacturing. Major industries include the steel, automobile, shipbuilding, aircraft manufacturing, and petroleum refining industries. The gross regional product of the three northeast provinces totaled ¥1.63 trillion in 2002. In recent years, the Chinese government has initialized the "Revitalize the Northeast campaign" to turn this region into one of China's economic growth engines. As of 2015 the region was losing population and the economy, dominated by state-owned enterprises, was stagnant. Culture In general, the culture of Northeast China takes its elements from the cultures of North China and Shandong, where most of the Han Chinese migration into Northeast China, known as Chuang Guandong, Tungusic peoples and its own innovations. Dialects There are two main dialects of Mandarin Chinese spoken in Northeast