Wow, how did you achieve that? It could have been the random settings. Try going with the default/standard settings. The main reason for me for sticking with Tectonic is exactly the good balance of land vs sea with land massive enough to allow big battles without hindering AIs with too many chokepoints and snaky peninsulas. Oh, and one more thing, the world sizes are about 1 step larger than standard, so huge is really huge. And one more one more thing, make sure that you are playing Tectonic, not Tectonics - these 2 are different.