Why is it die League?

League 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
Sense 1
die

Meaning

[1] Octed: Historical Lengths used in North America and England

[1] veraltet: historisches, in Nordamerika und England verwendetes Längenmaß

Examples

[1] "When we reached the island, we discovered that the lake behind it was two Leagues covered with ice" "

[1] „Als wir die Insel erreicht hatten, entdeckten wir, daß der See dahinter zwei Leagues weit mit Eis bedeckt war.“

Declension

1 Singular Plural
Nominativ die League die Leagues
Genitiv der League der Leagues
Dativ der League den Leagues
Akkusativ die League die Leagues

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary