harsh/different planets was RE: Latest Nations/States/Organizations document

One of Poul Anderson's "Flandry" books ("Ensign Flandry") has a world
inhabited by 2 intelligent species, one on land (Tigeries) and the other
marine (Seatrolls), and both at a similar level of culture (very roughly
bronze age). The two are opposed to each other (both want to exploit sea
resources) and a proxy war is going on, the Tigeries being supported by the
Human Imperium and the Seatrolls by the nonhuman Roidhunate of Merseia,
themselves in a state of cold war. The locals on both sides are getting some
modern weaponry, intelligence and the occasional "advisor".

A situation like this might make an intriguingly different setting for DSII or
SG2