ONSET ISLAND (MASSACHUSETTS) Latitude and Longitude:
|Area||0.01875 sq mi (0.0486 km2)|
|Length||0.2 mi (0.3 km)|
|Highest elevation||16 ft (4.9 m)|
Onset Island is a small island located at the western end of the Cape Cod Canal in the Town of Wareham, near Onset, Massachusetts. It is accessible by private boat. Approximately fifty families have summer homes on the island.
Generally, one needs to be a homeowner, a guest of a homeowner, or someone who has rented a cottage from a homeowner, to visit the island. 
- Estrella, John (1996-05-26). "Treasured islands". The Standard-Times. Ottaway Newspapers, Inc.
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