I don’t see any signs here...are we still in Maasai Mara or have we already crossed into Serengeti? This did happen several times to us on our safari. We didn't know if we were in Kenya or in Tanzania. Nobody cared. The beauty of open / porous borders!! (BTW, the same geographical region which is part of Tanzania is called Serengeti, while the part in Kenya is called Maasai Mara.)
Shot with a 70-300mm lens (@300mm) on Nikon D3100, on an African safari somewhere in Maasai Mara or Serengeti.