Is it der, die or das Ilmenau?

Why is it das Ilmenau?

No ending, compound or meaning rule gives away the article of Ilmenau, so learn the two together: das Ilmenau.

Sense 1

das

[1] City in Thuringia, Germany

[1] I was born in Ilmenau
[1] Ich bin in Ilmenau geboren.

[1] I spent my vacation in Ilmenau
[1] Ich habe in Ilmenau meinen Urlaub verbracht.

More source examples (1)

These dictionary examples can include historical and less common uses.

[1] Many paths lead to Ilmenau
[1] Nach Ilmenau führen viele Wege.

1	Singular	Plural
Nominativ	(das) Ilmenau	—
Genitiv	(des Ilmenau) (des Ilmenaus) Ilmenaus	—
Dativ	(dem) Ilmenau	—
Akkusativ	(das) Ilmenau	—

Sense 2

die

[1] River in Lower Saxony, Germany, left tributaries of the Elbe

[1] Fluss in Niedersachsen, Deutschland, linker Nebenfluss der Elbe

[1] At 107 km, the Ilmenau overcomes a height difference of 33 mä
[1] Auf 107 km überwindet die Ilmenau einen Höhenunterschied von 33 m.

[1] We crossed the Ilmenauä
[1] Wir überquerten die Ilmenau.

More source examples (1)

These dictionary examples can include historical and less common uses.

[1] The children tried to Baden in the Ilmenau
[1] Die Kinder versuchten, in der Ilmenau zu baden.