nationalisation(The transfer of ownership of a private business or other private property to a national government, either through uncompensated seizure (expropriation) or through forced sale at a government-determined price)
natural area(An area in which natural processes predominate, fluctuations in numbers of organisms are allowed free play and human intervention is minimal)
natural areas protection(Active management of nature areas in order to ensure that wildlife is protected and the quality of its environment is maintained)