What countries were not part of the roman empire?

Several countries were not part of the Roman Empire, including most of northern and eastern Europe. Notable examples are Germany, Poland, and the majority of Scandinavia, which remained outside Roman control. Additionally, regions like modern-day Russia and the vast majority of the British Isles were also never fully integrated into the empire. The Roman Empire primarily encompassed the Mediterranean basin, parts of North Africa, and areas of western and southern Europe.