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Which countries are landlocked by other landlocked countries, so you must cross two borders to reach the sea?

Liechtenstein and Uzbekistan

Liechtenstein is ringed by Switzerland and Austria, both landlocked. Uzbekistan's neighbours are Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan and Turkmenistan. None has ocean access, since the Caspian is a lake.

How many countries does the Danube flow through?

Ten

The Danube passes through Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova and Ukraine. That is more countries than any other river in the world.

Which two countries share the shortest international land border?

Vatican City and Italy

The Vatican's entire perimeter is its border with Italy, roughly 3.4 km. Monaco's border with France is about 6 km, the next shortest.

Which is the largest city in the world by land area?

Chongqing

Chongqing's municipality covers about 82,000 km2 (larger than Austria), though most of it is rural. By built-up area, Tokyo and New York are far bigger.

Which country switched from driving on the left to the right overnight in 1967?

Sweden

Dagen H, 3 September 1967. Sweden's neighbours drove on the right and most Swedish cars were already left-hand drive. Accidents actually fell at first, as everyone drove nervously.

Which country claims the oldest continuously used national flag?

Denmark

The Dannebrog is traditionally dated to 1219 and has been in continuous use since at least the fourteenth century, making it the oldest still-flown national flag.

Which country generates almost all its electricity from a single hydroelectric dam?

Paraguay, from Itaipu

Itaipu on the Brazilian border produces far more than Paraguay uses, so most of its share is exported to Brazil. Paraguayan electricity is nearly all hydroelectric.