Answer:
North Korea, officially the Democratic People's Republic of Korea, is a country in East Asia constituting the northern part of the Korean Peninsula, with Pyongyang as its capital and the largest city in the country. To the north and northwest, the country is bordered by China and by Russia along the Amnok and Tumen rivers, and to the south, it is bordered by South Korea, with the heavily fortified Korean Demilitarized Zone separating the two. Nevertheless, North Korea, like its southern counterpart, claims to be the legitimate government of the entire peninsula and adjacent islands.
North Korea remains isolated due to two reasons: A. US has an alliance with the South. So it is not ready to let its allies communicate with the North. Since the US was the dominating power for long the countries not its allies too were not prepared to risk its displeasure.
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It is known as the Revisionism. Inside the Marxist development, the word revisionism is utilized to allude to different thoughts, standards, and speculations that depend on a noteworthy modification of principal Marxist premises. The term is regularly utilized by those Marxists who trust that such modifications are ridiculous and speak to a "diluting" or deserting of Marxism.
        
             
        
        
        
It would be the oasis and aquifers provide water to the people. In the arid places people tend to supply by travelling around the desert and stopping in areas that has oasis and aquifers in order to replenish their water supplies. Also oasis and aquifers become stopping posts if it is a trade route for merchants and travelers in the arid regions.