Alps
The typical trees—oak, beech, ash and sycamore maple have a natural height limit: the 'tree line'. Their upper limit matches the change in climate which comes with increasing height. The change from a temperate to a colder climate is also shown true by a change in the wild flowering plant life. This limit normally lies about  above the sea on the north side of the Alps. On the southern slopes, it often reaches to , sometimes even to .