There is a cap to how much fall damage they can take. It has been this way for several years now.
You wouldn’t get that kind of result from a random map, any more than an old TV displaying static noise would happen to show the map of a country. Someone may have made a custom map to that effect, though.
For random map seeds with particular features, see the pinned thread in the Survivor Stories sub-forum. For custom maps someone may have made, I’d ask around on the Modding sub-forum. It’s non-ideal since you can’t go past a 32km square or whatever the limit is, but it also strikes me as the kind of thing somebody is bound to have tried.