English: what is the longest river in the world
German: was ist der längste fluss der welt
Spanish: cuál es el río más largo del mundo
French: quel est le plus long fleuve du monde
Italian: qual è il fiume più lungo del mondo
Portuguese: qual é o rio mais longo do mundo
Dutch: wat is de langste rivier ter wereld
Hindi: विश्व की सबसे लंबी नदी कौन सी है
Arabic: ما هو اطول نهر في العالم
Japanese: 世界でいちばん長い川は