Why is it die Themse?
Themse ends in -e, and most nouns ending in -e are feminine: in a German dictionary, 79% of them take die.
All nouns ending in -e die
Examples
Declension
| 1 | Singular | Plural |
|---|---|---|
| Nominativ | die Themse | — |
| Genitiv | der Themse | — |
| Dativ | der Themse | — |
| Akkusativ | die Themse | — |
Dictionary entries include material from Wiktionary. Wiktionary