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Until 2015, the India-Bangladesh border contained what oddity?

A third-order enclave

Dahala Khagrabari was an Indian plot inside a Bangladeshi enclave, itself inside an Indian enclave, inside Bangladesh. A 2015 land-swap agreement dissolved the whole tangle.

Which territory has the highest population density in the world?

Macau

Macau packs roughly 20,000 people per km2 into about 33 km2. Monaco is comparable; among larger sovereign states Bangladesh and Singapore lead.

Which country eats the most rice per person?

Bangladesh

Bangladesh consumes well over 200 kg per person a year, among the highest anywhere. China produces the most in total but eats less per head.

Which two national flags are so similar they are frequently confused?

Chad and Romania

Both are blue, yellow and red vertical tricolours differing only in the precise shade of blue. Chad objected at the UN when Romania readopted its version in 1989.

Which two countries have square national flags?

Switzerland and Vatican City

Both are 1:1. Switzerland's civil ensign at sea is rectangular, because square flags do not behave well on ships.

Which country has the lowest average elevation?

The Maldives

The Maldives averages about 1.5 m. The Netherlands averages about 30 m despite a quarter of it being below sea level, because of higher ground in the east.