Board Thread:Fiction Universe Discussion/@comment-5080468-20170728160023/@comment-47205-20170728165952

A few examples I can think of: I can't immediately think of any cases that are both 1) between different species and 2) land-based (outside of wars where both combatant sides control territory), but that doesn't mean there aren't any.
 * Leftover from pre-spacefaring times: Between spacefaring human nations on Earth, prior to the near-complete abandonment of the planet after the Jaharani Crusades.
 * Other single-species (I think):.
 * Different biomes: many planets were unknowingly shared by the terrestrial Ravon Imperial State and the aquatic.