A harbour is a sheltered body of water where ships, boats, and other vessels can dock, load, and unload cargo or passengers. Harbours are essential for maritime trade and transportation, providing safe refuge from rough seas and adverse weather conditions. They can be natural or man-made, often featuring facilities such as docks, piers, and warehouses. In addition to their economic importance, harbours also play a vital role in local ecosystems and communities. They can support fishing industries, recreational activities, and tourism, contributing to the cultural and social fabric of coastal regions. Notable examples include Sydney Harbour and San Francisco Bay.