La Gombe was a sandstone quarry from the 15th century until the year 1988. La Gombe is located on the banks of the River Ourthe, in the eastern Condroz, at the foot of a steep slope. The sandstone was initially quarried on a small scale. In the 19th century, the quarry was exploited mechanically. In 1883 a large section of the slope flew down; Until then, the ruins of the Montfort-la-Tour fortress tower stood on top of the slope. This tower stood in the Montfort district of the same name, which literally means fortified mountain. In the Middle Ages, the tower was a defense in the then Duchy of Limburg (high bank Sprimont) against raids from the Duchy of Luxembourg. Nothing has been found of Montfort-la-Tour since the great explosion of 1883. Several quarries followed each other over the centuries. As for the Montfort quarry, the site includes a series of five quarries dug in a row in the slope of the valley over a length of almost 1500 meters. There are two drowned excavations called “Lac bleu” for the largest and “Lac vert” for the second. The other three are dry. These quarries now enjoy the status of a private nature reserve, owned by the Société-cooperative de Montfort. Since 1977, the Gombe quarry became the Center Liégeois d'Activités Subaquatiques (CLAS), a deep-water diving centre. The depth is 31 meters and the clear water is suitable for diving courses. Due to the increase in the population in Montfort, habitation expanded towards the shore, as far as La Gombe. A school and a chapel were built. In the 20th century, the La Gombe train stop was still served. (Source: Wikipedia)