It's important to remember that "lowlands" generally refers to areas with relatively low elevation compared to surrounding areas. Spain has various lowlands depending on the region:
* The Duero Basin: This is a large plain in northern Spain, drained by the Duero River.
* The Ebro Valley: Located in northeastern Spain, this valley is drained by the Ebro River.
* The Guadalquivir Valley: This fertile plain in southwestern Spain is drained by the Guadalquivir River.
* The coastal plains: Along the Mediterranean coast, there are several lowlands, such as the coastal plain of Valencia and the coastal plains of Andalusia.
If you are looking for a specific region, please provide more context or specify the area you're interested in.