North Rock () is an offshore rock near the boundary between the Gulf of Maine and the Bay of Fundy east of the North American continent. Its ownership is disputed between the Canadian province of New Brunswick and the U.S. state of Maine as part of the territorial and maritime boundary dispute surrounding Machias Seal Island nearby to the south. The disputed area is referred to colloquially as the "Grey Zone". See also List of areas disputed by the United States and Canada List of islands of Maine List of islands of New Brunswick References Islands of Washington County, Maine Coastal islands of New Brunswick Canada–United States border disputes Disputed islands Landforms of Charlotte County, New Brunswick Islands of Maine Coastal islands of Maine