The Mississippi River.
The Mississippi River helped form the boundary between British and Spanish territory in 1763.
The sea.
The Ohio river
Mississippi River
British territory surrounded the globe. there was no western boundary.
The Panama Canal is in Panama, which is part of North America. However, it is between South America and the bulk of North America. The canal is not a natural border or boundary between the two continents.
The Amazon River in South America is an example of a natural boundary. It is a natural boundary because it is formed by a physical feature of the landscape, in this case, a river, that defines the border between different regions or countries.
The Appalachian Mountains.A wall of Mountains The 1,500-mile- long Appalachian Mountain range formed a natural barrier to westward expansion.
The Alps mountain range forms a natural boundary between France and Italy.
The Mississippi River serves as the natural boundary between Mississippi and Louisiana.
The Appalachian Mountains became the western boundary of the British colonies.
The natural boundary between British Columbia and Alberta is primarily formed by the Rocky Mountains. This mountain range serves as a significant geographical divide, influencing the flow of rivers and the climate in the respective provinces. Additionally, the Continental Divide runs along parts of this boundary, marking the separation between watersheds that drain into the Pacific Ocean and those that drain into the Arctic and Atlantic Oceans.