Traeth Mawr is a polder near Porthmadog in Gwynedd in Wales. The area was formerly the large tidal estuary of the Afon Glaslyn. It was created after large-scale land reclamation occurred in the late 18th and early 19th centuries. A large embankment, called the Cob, separates the area from the sea and carries a road and railway line.
The low-lying land that forms the polder of the Traeth Mawr
The old tollhouse at Boston Lodge
Ffestiniog Railway locomotive David Lloyd George on the Cob, heading towards Blaenau
The 19th-century embankment across Traeth Mawr which is known as the Cob
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:Land reclaimed from a body of water, such as a lake or the seabed
Flood plains separated from the sea or river by a dike
Marshes separated from the surrounding water by a dike and subsequently drained; these are also known as koogs, especially in Germany
Aerial view of Flevopolder, the Netherlands
Satellite image of Noordoostpolder, the Netherlands (595.41 km2)
Pumping station in Zoetermeer, Netherlands: The polder lies lower than the surrounding water on the other side of the dike. The Archimedes' screws are clearly visible.
The Yser river and West Flemish polders near Diksmuide
