Flat coast
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![Diagram of a flat coast littoral series. Key: B: bar, TNW: average low tide, THW: average high tide, US: shoreface; GS: foreshore, SW: berm, SR: runnel, HS: backshore, DG: dune belt, SK: dune cliff](/Images/godic/202501/25/Litorale_Serie_Flachküste2404.png")
![Wadden creek with exposed sandbar during an ebb tide](/Images/godic/202501/25/Priel_im_Sahlenburger_Watt2405.jpg")
![Start of the dune belt by the sand cliff](/Images/godic/202501/25/Quinta_do_Lago_beach_12405.jpg")
At a flat coast or flat shoreline, the land descends gradually into the sea. Flat coasts can be formed either as a result of the sea advancing into gently-sloping terrain or through the abrasion of loose rock. They may be basically divided into two parallel strips: the shoreface and the beach.