Oh, Tumblr. You will believe anything. The two oceans do not meet in Cape Point, they meet in Cape Agulhas, although the exact location is disputed. (A fact that might be difficult to carry on with were the demarcation so clear.) The confluence of various currents often creates bands or pockets of different (but apparently not markedly different) colors of water in this area, but there is not a clear line where the two oceans meet. IDEK what this is a picture of—It looks to me like ocean meeting a continental shelf. I can’t find anything on the internet to support or even source this photo. It might not even be of South Africa.
It probably isn’t.
Let Auntie Dawn lay some science down on y’all. Gather in a circle, kids, it won’t take long.
This has nothing to do with different oceans meeting, or even the colors of oceans, the directionality of ocean currents, or ocean anything. Get the word ocean out of your minds, it’s misleading to say the very least.
It has to do with density and salinity. There are several versions of this picture, as meetings like this can happen in many many places, but the earliest one Hoax or Fact found was this Flickr pic from 2010.
Taken in ALASKA.
This type of event happens when bodies of water of varying densities run into each other, such as, when a saltwater ocean meets the freshwater glacial runoff. Because fresh- and saltwater have such different densities they don’t mix easily creating a moving, but defined barrier like you see above.
It can happen pretty much anywhere you have meetings between large bodies of water that vary by density. Like this picture of the fjords where you can clearly see the shadows created by the different densities. The water’s calmer there, which is why you don’t have the foamy crest.
This can also happen horizontally, underwater. Then it’s called a Halocline.