10 most difficult rivers riddles A list of ten (out of 69) rivers related questions that are the most often answered incorrectly Rivers quiz What is the longest river in the United States?Missouri. The Missouri River is the longest river in North America. Having 2,341 mi (3,768 km), it is longer than the Mississippi (2,202 mi 3,544 km). When combined with the lower Mississippi River, it forms the world's third longest river system, after the Nile and Amazon.very hard 24% MississippiMississippi60%MissouriMissouri24%YukonYukon8%Rio GrandeRio Grande6%Created by: Shankar Kumar. Statistics based on 4368 answers in 4 languages »rivers of North America riddles » What is the largest affluent of the Baltic Sea in terms of mean discharge?Neva. Vistula is the longest of Baltic Sea affluents, but its mean discharge of 1080 m3/s is less than half of Neva (2500 m3/s). Other major Baltic Sea affluents are Daugawa nad Neman (both 678 m3/s).very hard 26% VistulaVistula44%NevaNeva26%DaugavaDaugava9%NemanNeman19%Created by: globalquiz.org. Statistics based on 2979 answers in 2 languages »Baltic Sea riddles » Which river flows into Lake Ontario?Niagara River flows from Lake Erie to Lake Ontario.very hard 27% Niagara RiverNiagara River27%Saint Lawrence RiverSaint Lawrence River53%Ohio RiverOhio River11%Columbia RiverColumbia River6%Created by: globalquiz.org. Statistics based on 661 answers in 9 languages »lakes riddles » Which river flows into the Arabian Sea?Indus rises in the Himalayas and flows southwards into the Arabian Sea. Other large rivers of the Indian subcontinent: Ganges or Brahmaputra, flow into the Bay of Bengal.very hard 28% IndusIndus28%GangesGanges21%Syr DaryaSyr Darya14%Jordan RiverJordan River35%Created by: globalquiz.org. Statistics based on 646 answers in 9 languages »Pakistan riddles » What is the third longest river of the North America? (after Mississippi and Missouri)Yukon, having 1,979 mi (3,185 km), is just 223 miles shorter than Mississippi. Despite its length, there are only four vehicles-carrying bridges across the river.very hard 30% Rio GrandeRio Grande23%YukonYukon30%ColoradoColorado42%ArkansasArkansas3%Created by: globalquiz.org. Statistics based on 8433 answers in 2 languages »geography of the United States riddles » Which river flows into the Sea of Azov?Don River. Sea of Azov is a small and shallow sea, sometimes regarded as a northern extension of the Black Sea. Two large rivers, Don and Kuban, flow into it, and so the sea has low salinity and a high amount of biomass (such as green algae) that affects the water colour. It was known in Ottoman Turkish as the Balük-Denis ("Fish Sea") from its high productivity.very hard 34% VolgaVolga19%Amur RiverAmur River32%AngaraAngara13%Don RiverDon River34%Created by: globalquiz.org. Statistics based on 985 answers in 9 languages »Ukraine riddles » Which river flows into the Bering Sea?Yukon River. The total length of the river is 1982 miles (3190 km). There are only four vehicle-carring bridges across the Yukon River.very hard 35% Lena RiverLena River15%YeniseiYenisei24%Amur RiverAmur River24%Yukon RiverYukon River35%Created by: globalquiz.org. Statistics based on 1024 answers in 9 languages »Arctic riddles » What is the largest river flowing into the Arctic Ocean?Yenisei. The average discharge of Yenisei is 19,600 m³/s. It is more than Mississippi, Ganges or Paraná.very hard 36% YukonYukon29%NevaNeva8%AmurAmur24%YeniseiYenisei36%Created by: globalquiz.org. Statistics based on 1107 answers in 9 languages »Russia riddles » Which river flows through Hanoi?Red River. The waters of river are indeed reddish because of the large amounts of red silt. very hard 38% Red RiverRed River38%MekongMekong35%Han RiverHan River18%Kwai RiverKwai River7%Created by: globalquiz.org. Statistics based on 1278 answers in 9 languages »Vietnam riddles » What does the color range represent in this picture?Water salinity. Launched June 10, 2011, Aquarius is NASA’s first satellite instrument specifically designed to study the salt content of ocean surface waters. The complete first year dataset of NASA's Aquarius instrument reveals seasonal changes in the Amazon River's plume. Depending on the prevailing currents, the river's freshwater outflow heads east toward Africa or bends up north to the Caribbean.very hard 39% water temperaturewater temperature34%sea currents speedsea currents speed12%water salinitywater salinity39%sea depthsea depth13%Created by: globalquiz.org. Statistics based on 10724 answers in 4 languages »satellite photography riddles » Play rivers quiz and see all the questions.