The system consists of three geographical elements:
1. Tourist Generating Regions (TGRs)
• A substantial volume of demand for leisure travel
activities area
2. Tourist Destination Regions (TDRs)
• The region which the tourist choose to visit and which
is a core element of tourism
3. Transit Route Regions (TRRs)
• The region which is the path through the region across
which the tourist must travel to reach his or her
destination (e.g. air, land, & sea transport services)