Appalachian mountains
The Ohio river
The eastern boundary of Russia's core is formed by the Ural Mountains and the Yenisei River. These natural features mark the division between European Russia and Siberia.
Antecedent boundaries are physical features, such as mountains or rivers, that existed before human settlement and often serve as natural divisions between regions. Examples include the Rocky Mountains in North America, the Himalayas in Asia, and the Amazon River in South America.
There is not an international border between Europe and Asia
Natural gender languages assign gender to nouns based on the actual gender of the living beings they represent, such as English. Grammatical gender languages assign gender to nouns based on arbitrary rules, such as Spanish or French. In natural gender languages, gender is inherent to the noun's meaning, while in grammatical gender languages, gender is a grammatical feature that may not correspond to the noun's actual gender.
British territory surrounded the globe. there was no western boundary.
The Mississippi River is the East boundary for Arkansas.
The sea.
The Mississippi River helped form the boundary between British and Spanish territory in 1763.
The Appalachian Mountains became the western boundary of the British colonies.
The Ohio river
Mississippi River
The Andes Mountains form Chile's natural eastern boundary, while the Pacific Ocean acts as its natural western boundary.
Baffin Bay forms a natural boundary between Greenland (an autonomous territory of Denmark) and Baffin Island (part of the Canadian territory of Nunavut).
Mississippi River
The Appalachian Mountains.A wall of Mountains The 1,500-mile- long Appalachian Mountain range formed a natural barrier to westward expansion.
Ohio river