Because both mods modify the same geographical areas in Romania, they cannot be used together without causing major bugs or map "holes".
In your mod manager, map add-ons like Project Muntenia should generally be placed below simulation mods but above basic assets. Project Muntenia 5.2.1v Roexterded Verze 1.39-1.40
is an independent map add-on for Euro Truck Simulator 2 (ETS2) designed to complement the Road to the Black Sea DLC . Version 5.2.1v was specifically maintained for game versions 1.39 and 1.40 , bringing localized Romanian content to the simulation. Key Features of Project Muntenia Because both mods modify the same geographical areas
Requires all official map DLCs, including Road to the Black Sea. Version 5
Users must choose one; Roextended offers a massive multi-country expansion (Romania, Bulgaria, Ukraine, etc.), while Project Muntenia focuses on high-detail local additions to the existing Black Sea DLC. Installation Notes (v1.39-1.40)