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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.

What is unusual about Paraguay's flag compared with every other national flag?

Its two sides carry different emblems

The obverse carries the national coat of arms and the reverse the treasury seal, so the two faces genuinely differ. Almost every other national flag is identical front and back or simply mirrored.

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.

Which South American country has English as its official language?

Guyana

Guyana was British; neighbouring Suriname is Dutch-speaking and French Guiana is French. South America is far less uniformly Iberian than it is usually drawn.