das Nachbarland
neighboring country
A country that shares a geographic border with another country.
Viele Deutsche fahren zum Einkaufen ins Nachbarland Polen.
Many Germans go shopping in the neighboring country of Poland.

neighboring country
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neighboring country
A country that shares a geographic border with another country.
Viele Deutsche fahren zum Einkaufen ins Nachbarland Polen.
Many Germans go shopping in the neighboring country of Poland.

The word is clearly made up of 'Nachbar' (neighbor) and 'Land' (country). So its meaning is literally a country that is a neighbor.
Die Schweiz ist ein Nachbarland von Deutschland.
Switzerland is a neighboring country of Germany.
Pay attention to the difference between direction and location. You travel 'ins Nachbarland' (to the neighboring country, accusative), but you are or work 'im Nachbarland' (in the neighboring country, dative).
Viele Pendler fahren jeden Tag zur Arbeit ins Nachbarland.
Many commuters travel to work in the neighboring country every day.
Common phrases are 'die Grenze zum Nachbarland überqueren' (to cross the border into the neighboring country), 'die Beziehungen zum Nachbarland verbessern' (to improve relations with the neighboring country), or 'Waren aus dem Nachbarland importieren' (to import goods from the neighboring country).
Die politischen Beziehungen zum Nachbarland haben sich verbessert.
Political relations with the neighboring country have improved.
neighbor
'der Nachbar' and 'das Nachbarland' can both express that something is directly next to something else. In everyday language, 'Nachbar' usually means a person, but figuratively it can also mean an adjacent country or region. 'Nachbarland' is much more specific: it always means a country that shares a border. Learners may confuse the words because, with countries, people sometimes also speak briefly of 'Nachbarn' (neighbors). If you are speaking clearly about geography or countries, 'Nachbarland' is more natural and unambiguous.

Viele Menschen fahren am Wochenende zum Einkaufen ins Nachbarland.
Many people drive to the neighboring country on the weekend to go shopping.
Deutschland und Frankreich sind Nachbarn in Europa.
Germany and France are neighbors in Europe.