What is the flat area at the base of an eroded cliff known as?

The flat area at the base of an eroded cliff is known as a wave-cut platform. This geological feature is formed through the continuous action of waves eroding the base of the cliff. As waves crash against the rock, they cause it to wear away over time, leading to the formation of a relatively flat area that extends outward from the cliff. This process can create a distinctive landscape at the shoreline, often visible at low tide. A wave-cut platform typically consists of the eroded rock and sediment that has been smoothed and shaped by wave action, making it a significant feature in coastal geology.