(Enorth.com.cn)Tianjin enjoys a rich supply of natural resources, which is quite rare in large cities both at home and abroad. First of all, Tianjin has abundant oil and gas resources. Its Bohai and Dagang Oil Fields are key state oil and gas projects, turning out 17,830,000 tons of crude oil and 880,000,000m3 of natural gas in 2005. Secondly, with its coastline stretching 153 km, Tianjin has inexhaustible sea salt resources. Changlu Salt Field, with an annual output of 2,300,000 tons of salt in 2005 (10% of the total sea salt output in China), is the most famous sea salt production base in China. Thirdly, Tianjin possesses rich mineral resources, metal and nonmetal. The major metal minerals include jimboite, manganese, gold, wolfram, molybdenum, copper, zinc, iron, etc.. Not only are the manganese and boron minerals first discovered in China, but they are rare even in the world. The nonmetal minerals here-cement rock, barites, stromatolith, marble, natural rock, purple sand porcelain clay, maifan stone, etc.-are of considerable mining values. Fourthly, plentiful underground warm water temperature ranges from 30℃ to 90℃ and, in additional to its excellent quality, the warm water is deposited at a shallow position. In ten areas with geothermal resources worth further prospecting and tapping, the total hot water reserve amounts to 110.36℃ billion m3. This is the largest medium and low-temperature geothermal field in China. Fifthly, Tianjin has abundant land resources. The total area of land in Tianjin is 1,191,900 ha., including arable land 445,500 ha. (37.4% of the total land area of Tianjin), residential, industrial and mining land 262,500 ha., and unused land 13,8200 ha.. Except for the mountainous and hilly areas in the north, the land in Tianjin abounds in fertile soil formed on a deep layer of accumulated matters. In the coastal area at the lower reaches of Haihe River, about 1,214 km2 saline and alkali wasteland have great potentials for development. Because of the convenient transportation in these areas, it is possible to develop the land at low cost. Such favorable conditions are not available in other large cities in China.