Simplify the following text for a Grade 10 native English-speaking person.
Original: Situated in the northern extremity of North America and covering about 1424500 k , this group of 36,563 islands comprises much of the territory of Northern Canada â `` most of Nunavut and part of the Northwest Territories .
Simplified: There are about 36,563 islands which have much of the territory of Northern Canada â `` most of Nunavut and part of Northwest Territories .