Maybe, just maybe, it’s the fact that France is actually rather a large country to have to cross between Belgium and Monaco, compared to the trivial English Channel to reach the UK? 🤷♂️🤔
I like all these quizzes on fantasy countries! Especially 'Belgium', since they just took parts of France and Netherlands and made some waffle-eating frankenstein. It supposedly had a long history as well which was probably inspired from those old German fairy tales.
I remeasured the distance again and got 790km. Here is the proof: https://drive.google.com/file/d/12LrGNsVoAz1_fPxSiXAkp6yLEFX48CIc/view?usp=drive_link
All jokes apart, good quiz :)