What are the reasons why Mongolia has a low population?
The birthrate of mongolian people is not that great. it might be related (in parts) to the fact that it is well seen in Mongolia to be drinking a lot / getting drunk, which can then lead to less effective reproductive rate.
also, being nomadic people (for most of the citizens, at least), there is need for larges spaces to move cattle around.
Another hint could be the way the country is not so hospitable. there are not much natural ressources, life is harsh, and most people are below poverty line.
Since people do not live in rivers, you may be asking which country that is near a river has a low population density. The two countries that might meet that description are Greenland and Mongolia. Both are in proximity to water (Mongolia is land-locked, but there are a few rivers; Greenland is an island, but it has an arctic climate), and yet both have a very low population density.
"The country's low population can be explained in part by its geographic and climatic extremes: Mongolia is home to soaring mountains and burning deserts, including the Gobi Desert in the southern third of the country; because of the country's high average altitude, winters are long and temperatures extreme." http://www.nationsencyclopedia.com/economies/Asia-and-the-Pacific/Mongolia.html
Sparse population means that the population density is very low. Population density is the number of people per square kilometer or mile. In order to find out country's density you have to divide the area by the population. For example Macau has a over 16000 ppl per square km, while Mongolia has only 1.5 personper square km. Mongolia is one of the most sparsely populated countries in the world.
What countries of East Asia has the lowest population groth rate of out of china japan North Korea and Mongolia?
In terms of statistics and percentage, Mongolia has the highest Buddhist population, because 98% of people who live in Mongolia follow Buddhism. But Mongolia is sparsely populated, so in terms of actual figures, the highest Buddhist population is in China, the most populated country in the world. It is estimated that anywhere from 277,588,896 to 1,057,481,510 people in China follow Buddhism.