Great Diamond Island is a small island located in Casco Bay, off the coast of Maine. It is part of the city of Portland and is known for its scenic views, historic buildings, and recreational opportunities. The island is primarily residential, with a mix of seasonal and year-round homes. The island is accessible by ferry, making it a popular destination for visitors looking to enjoy outdoor activities such as hiking, biking, and kayaking. Great Diamond Island also features a golf course and several beaches, providing a peaceful retreat from the mainland's hustle and bustle.