Final answer:
Georgia is bounded by the Caucasus Mountains, being part of the Transcaucasia region, whereas Kazakhstan, which is located further east, does not border the Caucasus and is not affected by it as a boundary.
Step-by-step explanation:
The Caucasus Mountains serve as a natural boundary for Georgia but not for Kazakhstan. Georgia is located directly to the south of Russia, bounded by the Caucasus Mountains to the north, making it a part of the region known as Transcaucasia. This region also includes Armenia and Azerbaijan and serves as a bridge between Europe and Southwest Asia. In contrast, Kazakhstan is situated further to the east and does not border the Caucasus region, thus it is not influenced directly by the natural boundary created by the Caucasus Mountains.