When you see a map how you can differentiate between two countries?
With respect to borders.
So we can say political Map of the world is defined by a imaginary line called borders. This helps to govern a Society. Many borders are according to Natural landscapes, many are according to Languages. But there are many borders which does not have this type of logic. We can say these are world’s strangest borders.
(1.) Border between North Korea & South Korea :
Both countries North Korea & South Korea are technically still in a war because there is no peace treaty signed till now. Both nations are separated by 160 miles long Demilitarized Zone(DMZ). It was created when Korean war ended on 1953. It is also the world’s thickest border. It is 2.5 miles wide. It has a Joint Security Area at the west side of DMZ.
Kaliningrad is a town of Russian Federation but it is situated in the middle of European Union. It is located in between Poland , Lithuania & Baltic sea. It is hundreds of kilometres outside of Russian mainland. It is 1088 km west of Moscow. It was earlier known as Konigsberg. And it was the capital of East Prussia. It was captured by Red army in 1945 and renamed as Kaliningrad in honour of soviet leader Mikhail Kalinin. It is largely populated by Ethnic Russians.
Azerbaijan & Armenia has a history of Tensions which created 1000 km of boder to be close De Facto state or Unrecognised territory called Nagorno Karabakh. Nagorno Karabakh Internationally recognised as a part of Azerbaijan. It is populated by Christian Armenians and Governed by Republic of Artsakh. You can only enter here from Armenia.
(4.) United Nations Buffer Zone in Cyprus:
This is a demilitarized zone which was established after the ceasefire of 16 August 1974 following Turkish invasion of Cyprus. It remains as a partition line which is also known as green line between Republic of Cyprus and Unofficial Turkish Republic of Northern Cyprus in the north. The zone cuts the city of Nicosia. Separating the city in southern and northern section.
(5.) Diomede Island :
Do you Know America & Russia are neighbouring countries.The diomede island is located between mainland Alaska and Siberia. Big diomede and little diomede are also separated by International Date line.