A coastline is the area where land meets the ocean or sea. It can vary greatly in shape and size, featuring sandy beaches, rocky cliffs, or marshy wetlands. Coastlines are important ecosystems that support diverse wildlife and plant species. They also play a crucial role in human activities, such as fishing, tourism, and transportation. Coastlines are constantly changing due to natural processes like erosion and sediment deposition. Factors such as waves, tides, and currents can shape the land over time. Additionally, human activities, including construction and pollution, can impact the health of coastal environments, making their preservation essential for future generations.