Sydney Harbour is a substantial saltwater harbour located on the southeastern coast of Cape Breton Island, Nova Scotia. The city of Sydney is situated along its southeastern arm, at the mouth of the Sydney River. The harbour's historical significance includes its use by the Mi'kmaq as a traditional canoe portage route between the harbour and the East Bay of Bras d'Or Lake via the Sydney River valley. For modern paddlers, kayak rentals are available, and guided tours, such as the Sydney Harbour Bridge Kayak & Breakfast Tour, are popular for experiencing the waterway. These tours offer views of the iconic Harbour Bridge and the historic waterfront. The harbour is a working port with significant boat traffic, including oceangoing ships and a major ferry service to Newfoundland operating from North Sydney Harbour, a distinct area within the larger harbour system. This necessitates careful navigation and awareness of vessel traffic, particularly in the main channels. A designated area exists for independent exploration by personal watercraft like jet skis, indicating zones where paddlers should be especially vigilant. The shoreline has seen recent infrastructure work, including wharf removal and shoreline reinstatement projects within Sydney Harbour proper. The harbour's exposure to open ocean conditions at its mouth can lead to wind and wave activity, and its large size creates a significant fetch. Paddlers must plan for tidal currents and potential weather changes common to a coastal Atlantic harbour.