Hill chain

The transition from a hill chain to a mountain chain is blurred and depends on regional definitions of a hill or mountain.

For example, in the UK and Ireland a mountain must officially be 600 m (2,000 ft) or higher,[1][2] whereas in North America mountains are often (unofficially) taken as being 1,000 ft (300 m) high or more.

[3] The chain-like arrangement of hills in a chain is a consequence of their collective formation by mountain building forces or ice age earth movements.

Hill chains generally have a uniform geological age, but may comprise several types of rock or sediment.

They are crossed by roads that often use a natural saddle in the terrain.