The Kennebecasis River is a tributary of the Saint John River in southern New Brunswick, Canada. The name Kennebecasis is thought to be derived from the Mi'kmaq "Kenepekachiachk", meaning "little long bay place." It runs for approximately 95 kilometres, draining an area in the Caledonia Highlands, an extension of the Appalachian Mountains, inl…The Kennebecasis River is a tributary of the Saint John River in southern New Brunswick, Canada. The name Kennebecasis is thought to be derived from the Mi'kmaq "Kenepekachiachk", meaning "little long bay place." It runs for approximately 95 kilometres, draining an area in the Caledonia Highlands, an extension of the Appalachian Mountains, inland from the Bay of Fundy.