How thick is the sedimentary rock that underlies the lowlands formed?

The thickness of sedimentary rock underlying lowlands can vary significantly depending on the specific geological context. Generally, these sedimentary layers can range from a few hundred meters to several kilometers thick. In some regions, particularly in sedimentary basins, the thickness may exceed several kilometers due to extensive deposition over geological time. Understanding the local geology is key to determining the precise thickness in any given area.