Answer:
Australia and Northern Asia
Step-by-step explanation:
Australia and Northern Asia are the two least densely populated areas in the world.
Australia is the largest island in the world, but it has very low population density because the vast majority of its territory is either arid or semi-arid.
Northern Asia includes Siberia, the Asian part of Russia, which has a population density of only 6.7 persons per square mile. While Siberia is not a desert, most of it is occupied by vast taiga forests with very few settlements scattered mainly in the southern half of the region.