How many Greater Londons laid end to end match the Greater Tokyo Area?
The Greater Tokyo Area measures 194.6 km (120.9 mi) east to west, and Greater London measures 58.4 km (36.3 mi) east to west. The Greater Tokyo Area comes to 3.33 times the east-west span of Greater London, a difference of 136.2 km (84.6 mi). Take 3 Greater Londons laid end to end and you reach 175.2 km (108.9 mi), still 19.4 km (12.1 mi) short of the Greater Tokyo Area; one more would overshoot by 39 km (24.2 mi). The Greater Tokyo Area is written in hundreds of kilometres and Greater London in tens of kilometres, a whole band of scale apart.
| Object | Real size | Axis measured | What the figure covers |
|---|---|---|---|
| Greater Tokyo Area | 194.6 km 120.9 mi |
East-west span | Widest extent of the outline on that axis |
| Greater London | 58.4 km 36.3 mi |
East-west span | Greater London Authority area |
Both figures, Greater Tokyo Area and Greater London, come from the Size It Up measurement set, one real-world size and one measured axis per object, last checked in September 2026; outline provenance is listed on the sources page.
Why this one is hard to judge by eye
The Greater Tokyo Area is drawn about 3.33 times as wide as Greater London as well as 3.33 times its east-west span, so the area it takes in the frame grows faster than the figure anyone quotes. The outline of the Greater Tokyo Area that most people carry comes from a world map, and every projection that keeps angles true stretches whatever sits far from the equator; the outline of Greater London above is scaled from measured distances instead.
What each figure covers
Greater Tokyo Area. The Greater Tokyo Area is a statistical region rather than a city, measured east to west. By population it is the largest urban area on Earth.
Greater London. Greater London is the administrative area rather than the built-up city, measured east to west. The continuous urban sprawl spills well past that boundary.
The Greater Tokyo Area and Greater London are both quoted as an east-west span, which is what makes the ratio above a like-for-like figure.
What else is about that size?
Measured the same way, Greater Tokyo Area at 194.6 km sits within a tenth of Grand Canyon National Park at 210 km and Cyprus at 210.4 km. Greater London at 58.4 km has Lake Geneva at 61.6 km and Singapore at 53.7 km for company, within a tenth. Swapping any of those in for the Greater Tokyo Area would move its ratio to Greater London by less than 10%.