There's another, much smaller one between Serbia and Croatia (https://osm.org/relation/5187149 https://osm.org/relation/5187149 ), complete with an attempt to e

There's another, much smaller one between Serbia and Croatia (https://osm.org/relation/5187149 https://osm.org/relation/5187149 ), complete with an attempt to establish a state on it (https://en.wikipedia.org/wiki/Liberland https://en.wikipedia.org/wiki/Liberland )