No these map dont have continents,because these is all one continent.
well i dont know how these will be original,but i have several option.
1.To be like others games,except that Cohors,Roma,Ships,Legions and Towns be neutral.
2.To all terittories be neutral,and only Towns to be open for players.
3.To all terittories be neutral,and players to start from Ships.
4.To all be open,and only Roma and cohorts to be neutral.
You see,we can find many gameplay options
Aim thinking that best solution it will be 2.
Only little problem is that these map will be for max, 7 players.