1. areas of land that are at a lower elevation compared to surrounding terrain; flat or gently rolling land at low altitude
The lowlands of the Amazon basin are covered with dense vegetation.
As terras baixas da bacia amazônica são cobertas por vegetação densa.
2. in geographical context, regions characterized by low altitude and typically flat topography
Many settlements were built in the lowlands near the river.
Muitos assentamentos foram construídos nas terras baixas perto do rio.