10 most difficult maps riddles

The Richat Structure in Mauritania, also known as the Eye of the Sahara, was interpreted as an asteroid impact structure, but no evidence of shock metamorphism has been found. Today, scientists believe that it is a huge (40 km in diameter) and deeply eroded geologic dome.

Poland bordered Germany, the Protectorate of the Czech Republic and Moravia, Slovakia, Hungary, Romania, the USSR, Latvia and Lithuania.

El Hierro, nicknamed Isla del Meridiano (the "Meridian Island"), is the smallest and farthest south and west of the Canary Islands. The line of longitude running through El Hierro (Ferro), the westernmost of the Canary Islands, was known in European history as the prime meridian in common use outside of the future British Empire.

Indonesia is the largest (1 905 000 km²), the smaller Alaska (1 718 000 km²), then Iran (1 648 000 km²), at the very end Mongolia (1 566 000 km²). If you doubt this result, look here - thetruesize.com.

Beijing is located in northern China. Its name, which means "Northern Capital", was applied to the city in 1403 during the Ming Dynasty to distinguish the city from Nanjing (the "Southern Capital").

Ho Chi Minh City is the largest city in Vietnam. Under the name Saigon, it was the capital of the French colony of Cochin-china and later of the independent republic of South Vietnam from 1955–75.

Ho Chi Minh City - 10° 46′ 36.8″ N, Bangkok - 13° 45′ 9″ N, Manila - 14° 34′ 48″ N and Mumbai - 18° 58′ 30″ N.

Washington, D.C. - 38° 54′ 17″ N, Beijing - 39° 55′ 0″ N, Tbilisi - 41° 43′ 0″ N, Rome - 41° 54′ 0″ N and Tokyo - 35° 41′ 0″ N.

Uzbekistan is bordered by five landlocked countries: Kazakhstan to the north; Kyrgyzstan to the northeast; Tajikistan to the southeast; Afghanistan to the south; and Turkmenistan to the southwest.

Gerardus Mercator was a 16th-century German-Flemish cartographer, geographer and cosmographer. He was renowned for creating the 1569 world map based on a new projection which represented sailing courses of constant bearing as straight lines—an innovation that is still employed in nautical charts. Mercator was one of the founders of the Netherlandish school of cartography.