1. Sea Cliffs: Steep rock faces along the coast that are formed when waves relentlessly undercut the base of the cliff, causing the overlying rock to collapse.

2. Sea Caves: Hollowed-out openings in cliffs formed by waves eroding weaknesses in the rock, often along cracks or joints.

3. Sea Arches: Natural bridges of rock formed when waves erode through a headland, leaving a passageway.

4. Stacks: Isolated pillars of rock that stand out from the coastline, often formed when a sea arch collapses.