Roman Forts in Scotland

There were three distinct periods of occupation but Roman forts were consistent in their construction.
This map shows forts throughout Scotland
[googlemaps https://www.google.com/maps/d/embed?mid=1UYgaK0DfpahEXUop8SOz2oKrnjm3gYIY&ehbc=2E312F&w=640&h=480]The make-up of a fort is shown below