Sea stacks are tall, vertical rock formations that rise from the ocean, often created by the erosion of coastal cliffs. Over time, waves and weather wear away softer rock, leaving behind these hard, resistant structures. They can vary in size and shape, and are commonly found in areas with rugged coastlines. These natural formations are often seen in places like Ireland, California, and Australia. Sea stacks can serve as important habitats for various marine life, including birds that nest on their ledges. They also attract tourists and photographers who appreciate their unique beauty and the dramatic landscapes they create.