Situated in the south-central portion of the province, along the north shore of the Bay of Fundy at the mouth of the Saint John River, the city is split by the south-flowing river and the east side is bordered on the north by the Kennebecasis River where it meets the Saint John River at Grand Bay.
Saint John Harbour, where the two rivers meet the Bay of Fundy is a deep water port and ice-free all year long. Stonehammer UNESCO Geopark, the first Geopark in North America, is centred around Saint John.
In addition, most of the central peninsula is situated on a hill.
The central peninsula on the east side of the harbour and the area immediately opposite on the west side are the sites of the original city, which resulted from the merger of Parrtown and Carleton.) is the port city of the Bay of Fundy in the Canadian province of New Brunswick.The port is Canada’s third largest port by tonnage with a cargo base that includes dry and liquid bulk, break bulk, containers, and cruise.The Saint John River itself flows into the Bay of Fundy through a narrow gorge several hundred feet wide at the centre of the city.It contains a unique phenomenon called the Reversing Falls where the diurnal tides of the bay reverse the water flow of the river for several kilometres.The Mi'kmaq also ventured into the territory and named the area ''Měnagwĕs'', which means "where they collect the dead seals." Samuel de Champlain landed at Saint John Harbour in 1604, but the area was in English hands by the end of the Seven Years' War.