Southern Domestic Airspace

As geographically delineated in the Designated Airspace Handbook (DAH), all airspace within the Canadian Domestic Airspace (CDA) commencing at the Canada-United States border and extending northward to the southern limit of the Northern Domestic Airspace (NDA).

Glossary: Northern Domestic Airspace
As geographically delineated in the Designated Airspace Handbook (DAH), a subdivision of Canadian Domestic Airspace (CDA) commencing at the North Pole and extending southward to the northern limit of the Southern Domestic Airspace (SDA).
Glossary: Southern Control Area
A controlled airspace within the Southern Domestic Airspace (SDA) at 18,000 ft ASL and above.