The entire border of New Brunswick is shared with U.S. state of Maine, beginning at the southern tip of Beau Lake at 47°18′N 69°03′W﻿ / ﻿47.300°N 69.050°W﻿ / 47.300; -69.050, subsequently proceeding to the Saint John River.[62] The border moves through the River until 47°04′N 67°47′W﻿ / ﻿47.067°N 67.783°W﻿ / 47.067; -67.783, where it splits from the river and heads southward into the Chiputneticook Lakes at 45°56′N 67°47′W﻿ / ﻿45.933°N 67.783°W﻿ / 45.933; -67.783, which subsequently leads the border to the St. Croix River. The border proceeds through the St. Croix to Passamaquoddy Bay, which then leads it to Grand Manan Island into the middle of the Bay of Fundy.