Jokes aside, it's fascinating as a Brit to think that the greater area of one city would take up most of Wales. I can't imagine living that far away from central Tokyo and still being in greater Tokyo.
Tokyo is massive, but the outline in the image is really the region of Kantō, with several cities and rural areas. It's like saying greater London is the whole of the south east
Tokyo has about 9 mil people. However the biggest 5 cities account for about 20 mil people, which is about 16% of the population. In comparison, the top 5 cities in the US have about 0.6% of the population.
Almost everyone lives in Tokyo or cities west of it. Apart from Sapporo and Sendai, the biggest city north of Tokyo has 500,000 people (and even that's only about 100 km to the north).
Different countries define "greater city" in some fairly different ways.
Greater NYC, for example, contains like a dozen smaller satellite cities and their suburbs. It includes some of the largest cities in both New Jersy and Connecticut.
It takes me an hour and a half to commute to work by express train in my metropolitan area. The train only makes 5 stops.
That’s why tourists from outside the UK plan activities all over the island in a 3-day period; while many locals may never have traveled more than a few kilometres from home except to vacation in Spain, spending 3-4 hours traveling between points of interest in a day is standard practice in many parts of the world.
Sounds horrible. I don't travel for these reasons. Stress free is what I am for, and I have never been happy when vacationing out of my province (and sometimes within, depending).
Meanwhile my partner has been to China, Japan and various other places while we've been together. She doesn't even try to get me to go with her anymore, bless her heart.