St. Mary's Bay is a coastal suburb located in South Australia, known for its picturesque views and tranquil atmosphere. It is situated near the Gulf St Vincent, making it a popular spot for fishing, boating, and other water activities. The area features a mix of residential properties and natural landscapes, providing a peaceful environment for residents and visitors alike. The suburb is part of the City of Onkaparinga and is well-connected to nearby towns and amenities. Local parks and recreational areas offer opportunities for outdoor activities, while the nearby beaches attract those looking to enjoy the sun and sea.