Dobar izvor je ovaj istraživački papir o Bilateralnim odnosima Srbije i Bosne i Hercegovine od Centra za evropske integracije, 35. strana pa nadalje:

https://media.cpes.org.rs/2019/09/Bilateralni-odnosi-Srbije-i-BiH.pdf

(A good source from the Center for european integration, in Serbo-Croatian, on the bilateral relations between Serbia and Bosnia and Hercegovina, which discusses Međurečje from page 35 onwards.)

This border change is unfounded, no old Austro-Hungarian map can suddenly warrant a change to international borders that have been established since 1995. (Even though I'm obviously aware that the present-day border itself is based on the old aus-hun border)

https://en.wikipedia.org/wiki/European_route_E80 ??