oberösterreichisch
Upper Austrian
Relating to the Austrian federal state of Upper Austria, originating from it, or typical of it.
Die oberösterreichische Landeshauptstadt ist Linz.
The Upper Austrian state capital is Linz.

Upper Austrian
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Upper Austrian
Relating to the Austrian federal state of Upper Austria, originating from it, or typical of it.
Die oberösterreichische Landeshauptstadt ist Linz.
The Upper Austrian state capital is Linz.

This adjective is derived from the name of the federal state 'Oberösterreich' (Upper Austria). By adding the ending '-isch', the corresponding adjective is formed.
Die oberösterreichische Küche hat viele Spezialitäten.
Upper Austrian cuisine has many specialties.
Unlike geographic adjectives ending in '-er' (e.g. 'Wiener'), 'oberösterreichisch' (Upper Austrian) is declined like a normal adjective when it comes before a noun.
Wir besuchten einen oberösterreichischen Bauernhof.
We visited an Upper Austrian farm.
The adjective is often used in connection with geographic or cultural terms, for example 'die oberösterreichische Landschaft' (the Upper Austrian landscape), 'ein oberösterreichischer Brauch' (an Upper Austrian custom), or 'der oberösterreichische Dialekt' (the Upper Austrian dialect).
Die oberösterreichische Seenplatte ist ein beliebtes Urlaubsziel.
The Upper Austrian lake district is a popular vacation destination.
Austrian
'österreichisch' and 'oberösterreichisch' both refer to Austria. The difference is in how specific they are. 'österreichisch' fits when something generally comes from Austria or belongs to Austria. 'oberösterreichisch' is more specific and means only the federal state of Upper Austria. You can confuse them because Upper Austria is part of Austria. If the exact part of the country is important, 'oberösterreichisch' is more natural. If it is only about the country, 'österreichisch' is enough.

Nach dem Unterricht erzählte Paul von einem oberösterreichischen Fest in seinem Heimatort.
After class, Paul talked about an Upper Austrian festival in his hometown.
Im Restaurant bestellen wir heute österreichische Spezialitäten.
At the restaurant, we are ordering Austrian specialties today.