True: the salinity levels of the two seas are so drastically different, that it *appears* that they do not mix - they do, just very slowly, and sometimes they don't mix at all at the very top, surface level...resulting in an appearance like you see here.
7 Awesome Things to do in Vientiane, Laos. A lot of travellers aren’t exactly enthusiastic about the capital city of Laos. Vientiane has quite a lot to offer, though. Check out these awesome things to do in Vientiane, Laos to make your stay unforgettable!