The Atlas of Canada Terrestrial Ecozones The map Terrestrial Ecozones shows Canada's 20 ecozones. An ecozone is a classification system where the biotic and non-biotic are consistent as a unit in nature. Fifteen ecozones make up terrestrial Canada and five make up the marine waters bordering Canada. The marine ecozones are displayed to the 200 nautical mile (372 km) economic limit. Ecozones are useful for general nation ecologyecozones with geographygemscanadageneralterrestrialecozonesby 2 users