What was the western boundary of Georgia established after the original settlement?

The western boundary of Georgia, as it was established after the original settlement, is correctly identified as the Mississippi River. This boundary played a significant role in shaping the territorial limits of Georgia in the colonial period and during its early statehood. The Mississippi River served not only as a natural geographical marker but also as a crucial point in trade and navigation.

The Atlantic Ocean served as Georgia's eastern boundary, which is connected to its coastal geography rather than the western limits. The St. Mary's River marks part of the boundary between Georgia and Florida, while the Ohio River is located much further north and was not a boundary associated with Georgia. The designation of the Mississippi River as the western boundary reflects the historical context of territorial expansion and the importance of water routes in the development of the state.