The towns in this municipality on Greenland used to be split up. The main capital is among them, so it made sense to grasp the 800 km circumference even if it's just a few people. Anyway it's according to the topic, so as stupid as it might be, it is factually the largest cities by area, and goes to show that the question of which is the largest city is ambiguous.

Tokyo is usually considered the largest city, due to the largest population overall, but it doesn't have the largest area (Greenland) nor the largest population of a single municipal (Chongqing, China) nor the largest density (Macau, China) nor the largest area of skyscrapers (Hong Kong), so it's a thing depending on definitions.

It doesn't really matter much. If you're in the middle it, it's all just city until the horizon. Well, except for Greenland. You can probably throw a stone across all the houses in the largest city by area.