 The area comprising Industrial Cape Breton includes the following communities within the Cape Breton Regional Municipality and earned its name from the various industrial activities relating to steelmaking, heavy water production, coal mining, and spin-off industries.Referring to the north side of Sydney Harbour.The southeastern part of Cape Breton Island is home to the Sydney Coal Field, an extensive underground coal seam extending at an angle from the shore beneath the seafloor of the Cabot Strait.