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A thing to consider here is whether (and how) pieces with orthogonal-only moves (like the Rook, mainly) can travel between from one land/sea area to another of the same type. Also, how you plan to avoid bottlenecks at the corners (unless you consider that part of the concept, of course).

I have included Ships for the purpose of helping pieces crossing the water. I'm also thinking about bridges, or giving the power to one of the Hybrid Creatures to cross pieces to the desired place. 

On a separate note, as long as things are titanic in size, you might see if you could take a cue from Giant Chess.

The only thing that interests me from that game is how the Giant moves. 

I haven't decided yet on a strategy for this game but it should be a game that encourages invasion. Perhaps I might use two Kings per player, placed in each of the controlled "Continents".