The Eocho Mountains were a range of mountains, hills, and deep valleys far south of the equator on the planet Ossus in the Outer Rim Territories of the galaxy. Within the western mountains, the Jedi Order established the city of Knossa c. 24,500 BBY; serving as the center of Jedi culture for over 20,000 years. Several of the mountains in this range were filled with Adegan crystal caves, which the Jedi mined for these precious lightsaber crystals.