The Scottish Highlands and the Appalachians are the same mountain range, once connected as the Central Pangean Mountains.
The Central Pangean Mountains were an extensive northeast-southwest trending mountain range in the central portion of the supercontinent Pangaea during the Triassic period. They were formed as a result of collision between the minor supercontinents Laurussia and Gondwana during the formation of Pangaea.
Remnants of this massive mountain range include the Appalachian Mountains of North America, the Little Atlas of Morocco, Africa and much of the Scottish Highlands including Ben Nevis.
A number of mountain building periods were involved in the formation of the Central Pangean Mountains, including the Acadian, Caledonian, Alleghenian and Mauritanide orogenies.