Headlands and bays
A headland is an area of land that is surrounded by water on three sides. Very often, the land areas are called capes. A bay is an area of water. It is surrounded by land on three sides. The water areas are also called gulfs.
A bay is a large body of water in the land next to a sea or lake between two headlands. The waves coming to the shore in a bay are usually constructive waves, and because of this, many of them have a beach. A bay may be metres across, or it could be hundreds of kilometres across. A bay often contains beaches.
Bays form where weak rocks, such as sands and clays, are eroded, leaving bands of stronger rocks, such as chalk, limestone, or granite, forming a headland, or peninsula. Headlands and bays are formed when there are parallel sections of softer and harder rock perpendicular to the coast. The sea erodes the softer rock faster than the harder rock, forming a bay. The harder rock that is left protruding into the sea is the headland.
They also can be made by people mining off the coast.
Kells bay, on the Ring of Kerry in Ireland
Hanauma bay, on the island of Hawaii
Cape Horn is the southern tip of South America
The Cape of Good Hope is seen by many as the divider of the Atlantic and Indian Ocean