The Sea Stacks of the Pacific Northwest are unique geological formations created by the erosion of coastal cliffs. These tall, rocky pillars rise from the ocean, often standing alone or in groups, and are typically made of sedimentary or volcanic rock. Over time, waves and weathering have sculpted these structures, making them a striking feature along the coastline. These sea stacks are commonly found in areas like Olympic National Park in Washington and Cannon Beach in Oregon. They provide important habitats for various marine life, including birds and sea otters, and are popular spots for photography and nature observation.