Saint Andrews is a town in Charlotte County, New Brunswick, Canada. It is sometimes referred to in tourism marketing by its unofficial nickname "St. Andrews By-the-Sea".GeographySaint Andrews is located at the southern tip of a triangular-shaped peninsula extending into Passamaquoddy Bay at the western edge of Charlotte County. It is the shire town of the county.The town's street grid, laid out by Charles Morris about 1783, is oriented toward the waterfront, which faces St. Andrews Harbour and the Western Channel, which is formed by Navy Island. Saint Andrews Harbour is situated at the mouth of the St. Croix River and the town sits on the river's east bank at its discharge point into the bay.The town is directly opposite the community of Robbinston, Maine, 2 kilometres to the west across the river mouth.In addition to Navy Island, Minister's Island is another island in Passamaquoddy Bay that is adjacent to the town on its eastern boundary.Despite its proximity to the Canada–United States border, the nearest border crossings are 30 km away at St. Stephen or via a ferry service at Deer Island.