evidence: top ten longest rivers: Nile (Africa) 6,650 km; Amazon (South America) 6,436 km; Yangtze (Asia) 6,300 km; Mississippi-Missouri (North America) 6,275 km; Yenisey-Angara (Asia) 5,539 km; Huang He/Yellow (Asia) 5,464 km; Ob-Irtysh (Asia) 5,410 km; Congo (Africa) 4,700 km; Amur (Asia) 4,444 km; Lena (Asia) 4,400 km note: there are 21 countries without rivers: three in Africa (Comoros, Djibouti, Libya), one in the Americas (Bahamas), eight in Asia (Bahrain, Kuwait, Maldives, Oman, Qatar, Saudi Arabia, United Arab Emirates, Yemen), three in Europe (Malta, Monaco, Holy See), and six in Oceania (Kiribati, Marshall Islands, Nauru, Niue, Tonga, Tuvalu); these countries also do not have natural lakes