Name the desert in the northern part of western australia

Gibson Desert

Explanation:

Gibson desert is found in the interior of the western Australia and is found to the south of the tropic of Capricorn. Between the great sandy and the Victorian desert. Covers an area of 155,000 km square.  And thus is the fifth largest desert in Australia. And has a majority of people living in this area as indigenous.

81 is a composite number

Probably north korea if your family has decided to use only nuclear power.