Arctic

The Arctic, also known as the North Pole, is the northern most region of Earth. Temperatures there are sub-zero (of any scale) and it is an extremely dangerous place for humans.

If you're a flying Transformer, there is a good chance you've crahsed here at some point.

Animated continuity
Years before the Great War, Starscream and Skyfire surveyed the Earth in a scientific expedition. During their survey, Skyfire crashed in the Arctic. Starscream searched for his friend for some time, but couldn't find him. Millions of years later, the Decepticons, while trying to drain Earth's core of heat energy, discovered Skyfire. He was convinced to join the Decepticons out of his friendship with Starscream, but later turned on them for their ways. All he got for his trouble was being reburied under the ice.

Later, the Autobots, unburied Skyfire...when they needed a ride to South America. They couldn't have done that sooner?

Movie
Searching for the All Spark, Megatron entered Earth's atmosphere white hot in the Arctic. However, he melted the ice he was standing on, freezing him and sending him into stasis lock. Thousands of years later, Archibald Amundsen Witwicky lead the National Arctic Circle Expedition to chart the Arctic circle. While there, he discovered Megatron, who subsequently burned the location of the All Spark intop Witwicky's glasses.