Afghanistan shares the longest border with Pakistan at 2,600 Kms.
Luxembourg
Afghanistan does.
Pakistan shares the longest border with Afghanistan. It stretches on for over 1500km.
Bangladesh
CanadaCanada shares the longest border with the US.
Alaska
Sweden shares its longest border with Norway, which is located to the West of the country. This border is 2542 miles long. Its Eastern border is shared with Finland and is much shorter, about 1/3 that length.
India shares the longest border with Bangladesh with 4096 Kilometers
Afghanistan.
Belgium only borders one sea on its northwest border. It is bordered by the Netherlands to the north and shares a border with the North Sea.
The Country that shares the southern Border with the US is Canada.