From north to south, those groups are the Danubian Plateau, the Balkan Mountains (called Stara Planina, which means old mountains in Bulgarian), the focal Thracian Plain, and the Rhodope Mountains.
ແຕ່ ເຫນືອ ຮອດໃຕ້, ກຸ່ມເຫຼົ່ານັ້ນແມ່ນພູພຽງ Danubian, ພູພຽງບໍລະເວນ (ເອີ້ນວ່າ Stara Planina, ເຊິ່ງ ຫມາຍ ຄວາມວ່າພູເຂົາເກົ່າແກ່ໃນພາສາບຸນກາຣີ), ທົ່ງພຽງ Thracian Plain, ແລະພູ Rhodope.