The photo represents the mouth of the river falling into the ocean [in Iceland].An original source link is unfortunately not provided at the allhomosapienswelcome via, but the photographer is identified as Andre Ermolaev.
“A little bit upstream there is a yellow-colored brook flowing into the river, but yellow currents fail to mix with the main water flow. One can estimate the scale judging by the car tracks that are clearly seen on the black sand. This is just a river, just a volcano, just our planet.”
Addendum: Reader spyra found the photographer's website.