1 Maps generated by Freeciv 2.4, landmass 33 %, wrapped, 30 civs, 100 tiles/civ.
The same as single + small islands
Not wrapped
A new world for colonization can be vast...
...or very small
Landmass=15. The lower landmass the bigger chances for a few starting continents because they haven't grown enough during generating to be connected.