[Jade Tigers]

Assuming that we're not looking at areas that are currently on the map, the best options would be a place somewhat to the north-west of the northern continent that would be a northern extension of the southern continental plate or far off the eastern coast on a completely separate plate. So basically you would end up with either a Galapagos type of situation, or a Polynesian type of situation. In either case you end up with a mostly isolated and thus rather unique local ecology.