TAR1, TAR17, and TAR25 are the only seasons in which the teams travel to a different continent from the first leg to the second leg.
There are zero visits to South America from Legs 5 to 9.
There are zero visits to Africa in any season's Leg 9 and 11.
There are zero visits to Australia and Oceania from Legs 5 to 7.
Not counting TAR8, Legs 3 to 10 have zero visits to North America.
Obviously, there was never a single visit to Antarctica.
There was never an African penultimate leg.
TAR1 was the only time there was an African first leg.
Let me try making a route that can change these facts.
It will look very unrealistic though.
Leg 1: USA --> Cape Verde (11 teams)
Leg 2: Cape Verde --> Bahamas (10 teams)
Leg 3: Bahamas --> Guatemala (9 teams)
Leg 4: Guatemala (9 teams)
Leg 5: Guatemala --> Colombia (8 teams)
Leg 6: Colombia --> Kiribati (7 teams)
Leg 7: Kiribati --> Fiji (7 teams)
Leg 8: Fiji --> Antarctica (6 teams)
Leg 9: Antarctica (6 teams)
Leg 10: Antarctica --> Angola (5 teams)
Leg 11: Angola (4 teams)
Leg 12: Angola --> USA (Final 3 teams)
5 continents, 8 countries + Antarctica, no Europe and Asia.
I just wonder if that is diverse enough.
By the way, aside from USA, have any of these places been visited?