Well let's say we call one central zone in Lisbon, like N38º 45º, if you travel non stop to the West, you will end up in Terceira Island, in the Azores. Since you mean another nation, you will end up in Nassau, Delaware, USA. Actually Washigton DC is near the same line.
So, your answer: USA.
Lisbon
yes
BIUSxx
Lisbon is north of the Algarve.
Israel is directly south of Lebanon and west of Iran.
Haiti. :D
Iraq and (to some extent) Turkey.
The coordinates of Lisbon are 38.7223° N, 9.1393° W. Which means that Lisbon is West of the Prime Meridian (the Prime Meridian is zero degrees of Longitude).
Bulgaria is a nation that is directly south of Romania and west of the Black Sea. A small portion of Turkey is also in this region of Europe.
Lisbon, the capital of Portugal.
west coast of Portugal
Lisbon is the western capital of the EU, and thus is on the west coast of Europe.