floodplain
n.an area of land next to a river that is often flooded when the water level rises. This land is usually flat and very good for farming.
n.an area of land adjacent to a river or stream that is susceptible to flooding during periods of high discharge. Often characterized by fertile soil due to the deposition of silt during inundation.
“The farmer lives on a floodplain near the river.”
“Many ancient civilizations, such as the Egyptians, settled on floodplains because the soil was so rich for growing crops.”
“While the floodplain provides highly productive agricultural land, modern urban development in these zones often requires significant investment in levees and drainage systems to mitigate seasonal flood risks.”
“The semi-aquatic rodents were released in February as part of the National Trust's work to restore rivers, wetlands and floodplains on the 5,000-hectare site.”
“He grew up in a farming family near Kaziranga, on the floodplains of the Brahmaputra, where the river routinely shifts its banks and forces families to resettle.”
From flood + plain.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.