Only two mountain ranges separate the continents: Ural & Caucus Mountains.
Europe and Asia are separated by the Ural Mountains. The Ural Mountains act as a natural boundary between these two continents.
A tectonic boundary, such as a mountain range or a deep ocean trench, can divide continents. These boundaries are formed by the movement of tectonic plates and can create physical barriers between landmasses.
The Alps mountain range forms a natural boundary between France and Italy.
There are a few natural features that form a physical boundary between Europe and Asia. One of them is the Ural River.
There are actually two mountain ranges that act as a boundary, the Ural Mountains and the Caucuses.
Rivers, mountain ranges, oceans, etc. Those are considered "natural boundaries".
Nature has provided the Pyrenees Mountains as the boundary between France and Spain.
An example of a mountain boundary is the border between Nepal and China, which is marked by the Himalayas. The towering peaks and rugged terrain of the mountains serve as a natural barrier between the two countries.
A natural boundary is a boundary that is viewed from a physical factor like a mountain, river, or other land form/waterway. A political boundary is a boundary that is man made or decided by people. For example the state border is a political boundary.
The Pyrenees stretch for about 300 miles (500 km) from the Bay of Biscay in the Atlantic Ocean to the Mediterranean Sea. This mountain range forms a natural boundary between France and Spain. The highest point is Pico d'Aneto at 3,404 metres.
The natural boundaries between the continents are oceans and seas. For example, the Atlantic Ocean separates Europe and Africa from the Americas, while the Pacific Ocean separates Asia and Australia from the Americas.