Beach ridges are landforms found on coastal plains that indicate ancient shorelines and sea levels. They can be wave-built or wind-built, and may include submerged bars. These ridges are resistant to erosion and can be several meters high above high tide levels. Beach ridges are relict landforms formed by waves and wind in intertidal and supratidal zones. They are not the same as backshore berm ridges. Foredunes and cheniers are also types of beach ridges. By studying the layers of beach ridges, we can learn about past sea levels.