It isn't really a country but it is located in Egypt around 153 miles southwest of the center of Cairo.
In relation to the Andes mountain, the Atacama desert is located to the west. It actually lies between the pacific ocean and the Andes mountain. The Atacama desert is one of the driest place on earth. It is a rainless pleatue located in Southern America. The Atacama desert covers almost a 1000 kilometers. The desert mainly consists of salt lakes, rocks and sand. This is a place where rain occurred numerous years ago and so it is considered a totally rainless place. There is every probability that the Atacama desert is the oldest desert present in the earth.
If your question is literally how long they could remain without water, the answer is 1-2 days with major side effects, and 3-4 with certain death.
It’s B, they sometimes do follow the borders of countries
