With only 1.7 people per square kilometer, Mongolia has the lowest population density of any independent country, and it is this vast and majestic emptiness that is the country's enduring appeal, bringing the traveler, as it does, into a close communion with nature and its nomadic inhabitants. Mongolia is entirely landlocked, sandwiched between China and Russia. The country is nicknamed the "Land of Blue Skies," and with good reason. There is said to be about 250 sunny days throughout each year. The weather is bitterly cold during the winter, dropping down to -40º F in some parts. With many types of terrain from desert to verdant mountains, the weather during the summer varies from region to region, but is generally hot. Outside of the Gobi desert, this time of year is marked with many rains in some areas, and it can become quite cool at night.