in the resort town of skagen, you can watch an amazing natural phenomenon. this city is the northernmost point of denmark, where the baltic and north seas meet. two opposing tides in this place can not merge because they have different densities.
Gulf of Alaska: where two oceans meet, but never mix! is a result of the melting glaciers being composed of fresh water vs the higher percentage of salt causing the two ocean bodies of water to have different densities!