All "find your friends" Facebook apps listed here: https://www.makeuseof.com/tag/5-ways-facebook-friends-world-map/, do not work anymore. This article was from 2011, but all searches for more recent alternatives have been fruitless.
There is of course the "nearby friends" feature, but it only shows people that have turned the feature on. It does not "crawl" through one's friends list and collect the "Lives in" datum from each person's profile, even though this should theoretically be very possible.
It seems that there is also a SnapChat imitation in Facebook: https://9to5mac.com/2018/10/03/facebook-location-sharing-nearby-friends/, but when I click on "nearby friends" on my phone here in Canada, it only shows the list (not the map). It is possible that the SnapChat-like feature only works in USA (it is also true that you can "send money" on Facebook messenger when you're in the USA, but cannot when in Canada).