With slightly over 2.1 million citizens, New Mexico is the 36th most populous and 46th most densely populated state. [2nd] Northern and eastern regions have a colder alpine climate, while the west and south are warmer and drier; the Rio Grande and its fertile valley run from north to south, creating a riparian environment that supports a bosque habitat and distinct Albuquerque Basin climate. The federal government owns one–third of New Mexico's territory, and the state has most UNESCO World Heritage Sites.
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