The Eger Graben (much less commonly called the Ohre or Ohře Graben; Czech: Oherský rift, German: Egergraben) is a geological structure in the Czech Republic.
The Ohře (equally commonly known in English by its German name Eger, hence the name of the trough) flows through the Eger Graben and separates the Ore Mountains from the Slavkov Forest and the Doupov Mountains.
The trench continues to the northeast along the valley of the Bílina and later, as the North Bohemian Basin, separates the Ore Mountains from the Bohemian Central Mountains, where the River Ohře leaves the graben and flows into the Elbe south of the Bohemian Mountains.
It was formed by the almost complete erosion of the Variscan Mountains and sits on a fault-block caused by the horizontal pressure of the African continental plate.
The trench thus follows the main fault line of the Ore Mountains.