Although Belgium certainly isn't as rugged as Pakistan, it's far from flat and especially in Wallonia population is very concentrated along one valley (the sill

Although Belgium certainly isn't as rugged as Pakistan, it's far from flat and especially in Wallonia population is very concentrated along one valley (the sillon Sambre et Meuse): https://www.researchgate.net/profile/Kobe-Boussauw/publication/293641051/figure/fig1/AS:348457123500032@1460090060752/Population-density-in-Belgium-Source-Statistics-Belgium-2010.png https://www.researchgate.net/profile/Kobe-Boussauw/publicati... As a result, the region has a population density of 240/km² (only slightly less than Pakistan) but about 2/3rds of the population is in this valley representing 1/16th of the area of Wallonia. Flanders is mostly flat and more evenly settled. This is actually more similar than I expected to the population distribution in Pakistan, with Punjab being a flat plain with an evenly distributed population, and the rest of the country being mostly settled along one river. By the way, Belgium also suffered a large flooding event last year in this valley, although nowhere near as deadly as what is happening in Pakistan.