Jane's Bay) provided for visitors on Aunt Jane's Bay - some inlanders who live inland on the island park their vehicles along the road. There is a normal US postal service delivery route onto the island Monday through Saturday. The island also recently received street signs marking the island's few official unpaved roads. The people who live on this island are known to locals as "Islanders". The Grindstone Island Upper Schoolhouse was added to the National Register of Historic Places in 2012. Geography Grindstone Island is the fourth largest of the islands in the Thousand Islands region, measuring about long and wide at its widest point. The northern part of the island is near the Canada–United States border. The island is in the western part of the St. Lawrence river valley, and is located between Wellesley Island (New York, United States) and Wolfe Island (Ontario, Canada), about from Clayton on the New York mainland. Thousand Island Land Trust holdings Thirty-nine percent of the island is currently owned by the Thousand Island Land Trust (TILT). Their of private conservation lands are currently spread over different parts of the island. TILT currently owns Potter's Beach ( - the largest naturally occurring sand beach on the American side of the Thousand Islands), Potter's Forest Preserve (), Mid River Farm Preserve (), Douglas Howard-Smith Preserve (), Rusho Farm Preserve (), Delaney Farm Preserve (), Heineman Forest Preserve () and Grindstone Nature Trail (). TILT acts as a steward of another of wetlands, forest and grasslands on privately held property through conservation easements. Communities and locations on Grindstone Island Aunt Janes Bay — A bay on the south shore Canoe-Picnic Point State Park — A state park on the northeast tip of the island is currently only accessible by canoe or other small watercraft "The cheese factory" — A once-active factory from when dairy farmers were abundant on the island. It was shut down when the farmers ceased producing milk. Cummings Point — The tip of a short peninsula of the island on the southwest end Murdoch Point — The tip of a short peninsula of the island on the southwest end, northeast of Cummings Point Delaney Bay — A bay at the northeast part of the island. Dodge Hall — A community center on Northshore Road Flynn Bay — A bay on the southwest end of the island Grindstone — A hamlet on the