
die Ostseite
east side
The side of an object, building, mountain, or area that faces east.
Die Fenster auf der Ostseite des Hauses bekommen die Morgensonne.
The windows on the east side of the house get the morning sun.
east side
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east side
The side of an object, building, mountain, or area that faces east.
Die Fenster auf der Ostseite des Hauses bekommen die Morgensonne.
The windows on the east side of the house get the morning sun.
The word is built very logically and consists of the compass direction 'Ost' (east) and the noun 'Seite' (side). So it literally refers to the side that faces east.
Die Ostseite des Berges ist besonders steil.
The east side of the mountain is especially steep.
Following the same pattern, you can form the sides for all compass directions. The other words are 'die Westseite' (the west side), 'die Südseite' (the south side), and 'die Nordseite' (the north side).
An der Südseite des Hauses haben wir eine große Terrasse.
On the south side of the house, we have a large terrace.
To describe a position, the preposition 'auf' with the dative is usually used: 'auf der Ostseite' (on the east side). To show belonging, you use the genitive or 'von': 'die Ostseite des Gebäudes' (the east side of the building).
Auf der Ostseite der Insel gibt es einen wunderschönen Strand.
On the east side of the island, there is a beautiful beach.
east
Der Osten refers to the entire eastern part of an area. Die Ostseite, by contrast, is the side facing east of a limited object or area. Osten is appropriate for a district of a city, while Ostseite is used for a specific side, such as the side of a building.

Der Haupteingang der Schule liegt an der Ostseite des Gebäudes.
The school's main entrance is on the east side of the building.
Die neue Schule liegt im Osten der Stadt.
The new school is in the east of the city.