Unlike most large cities both athome and abroad, Tianjin enjoysa rich supply of natural resources.First of all, Tianjin has abundant oiland gas resources. Its Bohai andDagang Oil Fields are key stateoil and gas projects, turning out17.83 million tons of crude oil and 880 million m3 of natural gasin 2005. Secondly, with its coastline stretching 153 km, Tianjinhas inexhaustible sea salt resources. Changlu Salt Field, with anannual output of 2.3 million tons of salt in 2005 (10% of the totalsea salt output in China), is the most famous sea salt productionbase in China. Thirdly, Tianjin possesses rich mineral resources,metal and nonmetal. There are more than a dozen kinds ofmetal minerals in Tianjin, including jimboite, manganese, gold,wolfram, molybdenum, copper, zinc, iron, etc.. Not only are themanganese and boron minerals first discovered in China, butthey are rare even in the world. The nonmetal minerals here –cement rock, barytes, stromatolith, marble, natural rock, purplesand porcelain clay, maifan stone, etc.– are of considerablemining values. Fourthly, plentiful underground warm water isavailable in Tianjin. The underground warm water ranges from30 to 90 in temperature and, in addition to its excellentquality, the warm water is deposited at a shallow position. In tenareas with geothermal resources worth further prospecting andtapping, the total hot water reserve amounts to 110.36 billion m3–the largest medium and low-temperature geothermal field inChina. Fifthly, Tianjin has abundant land resources. The total areaof land in Tianjin is 1,191,900 ha., including arable land 445,500ha. (37.4% of the total land area of Tianjin), residential, industrialand mining land 262,500 ha., and unused land 138,200 ha..Except in the northern mountainous and hilly areas, the landin Tianjin abounds in fertile soil deriving from a thick layer ofaccumulated matters. In the coastal area at the lower reachesof Haihe River, about 1,214 km2 saline and alkali wastelandhave great potentials for development. With convenienttransportation, the land in these regions can be tapped at lowcost. Such favorable conditions are not available in other largecities in China.