Equator - its degree is 0 degree
According to the Washington State Department of Transportation Tacoma is located within the Olympic region.
The Black and Caspian Seas
<span>I suspect that the answer is at the surface of the open ocean. This is where the evaporation of water takes place which concentrates the salts at the very surface. However, with any significant mixing, the effect might not be measureable. Nevertheless, the surface tension of the water at the surface would tend to stabilize the very surface slowing down mixing with more dilute water just beneath the surface.</span>