Polders

largest city of the state of Louisiana, United States

thumb|Aerial view of Flevopolder, the [[Netherlands]] alt=|thumb|Satellite imagery|Satellite image of [[Noordoostpolder, the Netherlands (595.41 km2)]] A polder () is a low-lying tract of land that forms an artificial hydrological entity, enclosed by embankments known as dikes. The three types of polder are:

municipality in North Frisia

civil parish and reclaimed island in the Thames estuary in Essex, England

Powiat in Poland

naturally marshy region in eastern England

thumb|Plans for the creation of the lagoon designed by Pieter Philippus Jansen is a lake in Akita Prefecture in northern Japan. Its formal name is , but it is also called . At 4 meters below sea level, Hachirōgata is the lowest natural point in Japan.

swamp in France

River delta in Lithuania

village in the East Riding of Yorkshire, England, UK

hamlet and community in Flintshire, Wales, UK

thumb|250px|View of the basin of the crater remnant from Öjberget, a hill that belongs to the Rim (crater)|crater rim Söderfjärden is a polder in Ostrobothnia, western Finland, 10 kilometres south of the town of Vaasa. The plain is in an impact crater dating back to more than 640 million years ago (Proterozoic, near the end of the Cryogenian). The crater's diameter is and its maximum depth is . It is filled with Cambrian sandstones leaving only the outer rim visible. There is also a central uplift, which is buried. After rising from the sea due to post-glacial rebound, Söderfjärden was a wetla

lake in Chiba Prefecture, Japan

inland river delta and estuary in Northern California

Polder in Gwynedd, North Wales