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Sint-Jansbosch Quarries I and II together form one of the oldest parts of the marl quarry system in the forested area near Valkenburg. These quarries were dug centuries ago for the extraction of marlstone, the characteristic building material so typical of South Limburg. The entrances, half-hidden among trees and vegetation, exude a mysterious atmosphere, especially when the cool air rises from the subsoil. Walking past these historic sites, you experience the tranquility of the forest and the deep connection between man, nature, and craftsmanship. A fascinating stop for those who appreciate hidden history and the raw beauty of the Limburg landscape.

Deep in the tranquil woods near Valkenburg lie St. Jansbosch Quarries IV and V—two old marl quarries that recall the days when marl was still intensively mined here. The entrances, partially hidden among ferns and vegetation, exude a mysterious atmosphere and reveal the intertwining of nature and history here. These quarries were part of a larger network of underground passages once essential for the construction of many Limburg monuments. Today, they are silent monuments to craftsmanship and transience, offering a special place of peace and wonder during a walk through the woods.

Hidden in the verdant Limburg hills lies the Sint-Jansbosch Quarry III, a silent witness to the region's rich marlstone history. This former underground quarry was used to extract marlstone, which was used to build countless buildings in and around Valkenburg. Today, the place exudes tranquility and history. The moss-covered entrances and the cool air flowing from the quarry lend a mysterious atmosphere to the surroundings. A fascinating stop for those who appreciate geological heritage and hidden natural treasures.

The Pruus Karel II Quarry is a former marl quarry in South Limburg that offers an impressive glimpse into the history of marl extraction. The quarry boasts rugged white marl walls and a unique industrial atmosphere where you can almost feel the history of Valkenburg's building materials. Walking along the quarry, you'll see how nature and culture converge in this unique landscape.

The name Sint-Jansboschgroeve refers to the nearby Sint-Jansbosch, a forest area near Margraten in South Limburg. The use of the name “Sint-Jan” will have a religious origin, since such names in Limburg are often associated with patron saints or local chapels dedicated to saints. How many Sint-Jansbosch quarries are there? There are a total of three quarries known as Sint-Jansboschgroeve I, II, and III. These quarries are part of a network of marl quarries in the South Limburg hilly landscape.

The Heiberggroeve is one of the lesser known marl quarries in the area of Valkenburg, South Limburg. This quarry is located on the southwest side of Valkenburg and is part of the extensive network of underground passages and limestone quarries that are typical for this region.

The Pruus Karel II quarry is the only one of the three quarries called "Pruus Karel" whose entrance is visible, the other two are overgrown or covered under the ground. Small quarry, with a corridor length of approx. 34 meters; the entrance is closed off with a fence.

Small quarries in the St. Jansbosch. Not large, but surrounded by a fence.