Cape Horn, Chile
Some of the world’s roughest waters and mean climate are found at Cape Horn, the southernmost tip of South America.
The open stretch between South America and Antarctica is known for icebergs, 65+ high waves and regular terrible weather.
This is where the Pacific and Atlantic Oceans slam into each other as well as yet a third current from Antarctica. All of this is exacerbated by whirling Antarctica winds and Andes winds that create a funnel effect.
If you are like me, then you may not have known that Cape Horn is an island. Early sailors learned they could have relatively calmer waters a hair north in the Straights of Magellan. However, because they were much narrower and rocky, they took their toll on many a sailor.
Interesting point – Magellan came here in the winter because he did not yet know that the Southern Hemisphere seasons are opposite of that in Europe.