Why is it die Romandie?

Romandie ends in -ie, and nouns ending in -ie are feminine: in a German dictionary, 98% of them take die.

All nouns ending in -ie
Sense 1
die

Meaning

[1] Geography: The French -speaking part of Switzerland in the west of the country

[1] Geografie: der französischsprachige Teil der Schweiz im Westen des Landes

Examples

[1]

[1]

Declension

1 Singular Plural
Nominativ die Romandie —
Genitiv der Romandie —
Dativ der Romandie —
Akkusativ die Romandie —

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary