#10. Boiling Lake Dominica
#9. Citarum River West Java, Indonesia
#8. Rio Tinto Spain
#7. Lake Kivu Of DRC And Rwanda
#6. The Rivers Of Johannesburg South Africa
#5. Blackwater River Virginia, USA
#4. Tualatin River Oregon, USA
#3. Lake Karachay Russia
#2. Belle Fourche River And South Dakota, USA
#1. Potomac River Maryland–West Virginia Border, USA