St Mary's is the largest and most populous island of the Isles of Scilly, a group of islands located in the Atlantic Ocean off the southwestern tip of Cornwall, England. St Mary's is not technically considered a city but rather a town and a civil parish. It is the administrative center of the Isles of Scilly and is home to most of the population, as well as the main facilities and amenities of the archipelago. St Mary's has a small airport, a harbor, a hospital, schools, shops, restaurants, and accommodation options for visitors. The island boasts beautiful landscapes, picturesque beaches, and a rich history dating back thousands of years.