And here I present you, the world! Using extreme zoom out, hills appear cleary on map. If we assume that each concentration of hills is a continet, we get seven continents. Notice supersized X-shaped continent.
Buster (game creator) said that each faction will run into Hive. Also, notice that Gaians are on one of four ends of x shaped supercontinent. If we also take in consideration that each faction has a balanced starting position, which is approximately distanced equally from other factions, we can assume that on each of four ends of X-continent is one of four human controlled factions. A very reasonable assumption. Also, I am completely sure that if this assumption is correct, then Hive must be in the center of the X-continent. This also explains claim that each faction will run into Hive first.
There seem to be two continents, or a landmass with huge two land masses in the northeast from us. If we assume that for each of seven continents goes one of seven factions, and we already know that X-continent is occupied by five factions, we can safely deduct that Lal and Zak are on these two landmasses.
Green - rough shape of our continent
Mudblue- continents of other three factions
Blue - center of X-shaped continent assumed containing Hive
Red - other factions on a pair of two continents/continent with two large landmasses