mountain tunnelling.
An area of hills and mountains is called a mountain range.
A land surrounded by mountains and hills is typically called a valley.
Channels are cut through mountains and hills primarily through erosion and weathering processes. Natural forces such as water, wind, and ice gradually wear away rock and soil, creating pathways over time. Rivers and streams play a significant role by carving out valleys as they flow, while glaciers can also sculpt the landscape. Human activities, such as construction and mining, can additionally alter terrain and create artificial channels.
A flat land surrounded by hills or mountains is called a valley.
A low lying land between hills or mountains is called a valley
a range of mountains is called mountain range
The low lands between hills or mountains is called a valley.
A lowland between hills and mountains is called a valley. Valleys are typically formed by the erosion of water or ice, and they often contain rivers or streams running through them.
The Blue mountains
A low land between hills or mountains is called a valley. Valleys are typically formed through erosion by rivers or glaciers over time. They often have fertile soil and are important for agriculture and settlement.
A chain of mountains are called mountains if there were only one mountain then it would simply be called a mountain as for hills and hill plural.
A group of mountains are called mountain ranges.