You can't have everything. Where would you put it? -Steven Wright
Question #71058 posted on 03/29/2013 10:04 a.m.
Q:

Dear 100 Hour Board,

Why is the Vrbas River in Bosnia & Herzegovina an emerald green color? It's quite stunning.

-Bound for Bosnia

A:

Dear Bound for Bosnia,

It doesn't look like any of us writers can give you a definite answer. I do, however, have three guesses:

  1. Green algae – These little critters like to live in rivers, and since they do not absorb green light, they can make the water appear green.
  2. Dissolved chemicals – Lime, copper, and other chemicals can make water appear blue, green, or turquoise.
  3. Reflection of surrounding foliage – From the pictures of the river I looked at, it appears that this river is surrounded by dense green foliage on both banks, which likely contributes to the river's color.

If any readers have a better answer, please comment!

--Maven