Big Island is an island in Prince Edward County, Ontario, Canada. Approximately in length and with a maximal width of , it is located in the Bay of Quinte in Lake Ontario, between Belleville and Demorestville. It is accessed by a fixed causeway of (, or 3⁄8 mi) length which connects Big Island to the remainder of Prince Edward County. The island is within the former Township of Sophiasburgh and is the largest of all off-shore islands in Prince Edward County.French, Orland (2013). Wind, Water, Barley and Wine: The Nature of Prince Edward County. Belleville: Wallbridge House. p. 65.
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