Maybe you are thinking of Chile, a South American nation which is majorily thin, yet long. However, it does not account for more than half of the Western Coastline of the Americas, only of South America.
That is Vilnius, capital of Lithuania
The South American country that has the longest coastline along the Atlantic Ocean is Brazil.
Morocco is directly south of Spain.
Brazil is the largest country in South America so naturally it borders many countries as well as the South Atlantic Ocean.
nytncd
Chile
It definitely has to be Chile (Western South America)
Dover
Nepal
did early mapmakers think that that the coastline of south america matched the coastline of asia
Vilnius is the capital city of Lithuania, the country that is south of Latvia and has a coastline on the Baltic Sea.
South Western. Sindh and balochistan have long 1000km+ coastline
The country that is south of Latvia and has a coastline on the Baltic Sea is Lithuania. Its capital is Vilnius.
brazil
Nigeria belongs to the continent of Africa.
chile
South Africa