Trehörningen

Trehörningen is Swedish for "The Triangle", or literally "The Three-Corner", and can refer to many different geographical locations, including:
 * Trehörningen (Sjödalen) - a lake in Huddinge Municipality, in the Sjödalen-Fullersta area.
 * Trehörningen, Hanveden - a lake in Huddinge Municipality, in the Hanveden area.
 * Trehörningen, Tyresta - a lake in Tyresjö Municipality, in Tyresta National Park