Sebascodegan Island or Great Island is an island at the eastern edge of

Casco Bay Casco Bay is an inlet of the Gulf of Maine on the southern coast of Maine, New England, United States. Its easternmost approach is Cape Small and its westernmost approach is Two Lights in Cape Elizabeth. The city of Portland sits along its south ...

on the

Gulf of Maine , image = , alt = , caption = , image_bathymetry = GulfofMaine2.jpg , alt_bathymetry = , caption_bathymetry = Major features of the Gulf of Maine , location = Northeast coast of the ...

. It is a part of the town of

Harpswell Harpswell is a town in Cumberland County, Maine, United States, within Casco Bay in the Gulf of Maine. The population was 5,031 at the 2020 census. Harpswell is composed of land contiguous with the rest of Cumberland County, called Harpswel ...

with the mainland portion of Harpswell to its west and

Orr's Island Orr's Island is an island in Casco Bay and the Gulf of Maine, part of the Atlantic Ocean. The island is within the town of Harpswell, Maine, U.S., and forms an archipelago with Sebascodegan Island (also known as Great Island) to its north and B ...

and Bailey Island to its south. The town of Brunswick occupies the mainland to the north, and the towns of West Bath and

Phippsburg Phippsburg is a town in Sagadahoc County, Maine, United States, on the west side of the mouth of the Kennebec River. The population was 2,155 at the 2020 census. It is within the Portland– South Portland–Biddeford, Maine, Biddefo ...

occupy the mainland to the east, across the New Meadows River.

References

Islands of Cumberland County, Maine Harpswell, Maine Islands of Casco Bay Islands of Maine {{Maine-geo-stub