What type of lowland area frequently experiences flooding due to poor drainage?

The correct answer is swamps. Swamps are areas of low-lying land that are often saturated with water, either from flooding or poor drainage. This saturation typically leads to the presence of waterlogged soil, making swamps a unique ecosystem characterized by the presence of water-loving plants and diverse wildlife. The hydrology of swamps means they are structured to retain water, which can result in frequent flooding, particularly in regions where the drainage is not adequate to allow for quick water absorption or runoff.

Other types of lowland areas mentioned, such as plateaus, basins, and tundras, do not share the same characteristics as swamps regarding flooding due to poor drainage. Plateaus are elevated flat areas, while basins can refer to depressions but do not specifically imply poor drainage necessarily. Tundras are cold, treeless regions with a layer of permanently frozen subsoil, which does not typically experience flooding in the same way swamps do. Thus, swamps stand out as the type of lowland area most frequently experiencing flooding due to the combination of their wet environment and poor drainage capabilities.