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The provinces of Vietnam are subdivided into second-level administrative units, namely districts (Vietnamese: huyện), provincial cities (thành phố trực thuộc tỉnh), and district-level towns (thị xã).
The Universal Transverse Mercator (UTM) is a map projection system for assigning coordinates to locations on the surface of the Earth.Like the traditional method of latitude and longitude, it is a horizontal position representation, which means it ignores altitude and treats the earth surface as a perfect ellipsoid.
St. Francis Dam (1926–1928) - failed March 12, 1928 San Clemente Dam - intentionally removed in 2015-2016 because of environmental issues Van Norman Dams (1911–1971) - failed February 9, 1971, in 1971 San Fernando earthquake