Gambella National Park is Ethiopia's greatest wildlife show-in-waiting, and being difficult to get to doesn't change that. It has vast herds of migrating antelope species including the second largest mammal migration in Africa which it shares with Boma National Park across the border in South Sudan, numbers to rival East Africa's great migration. For now, it remains a dream with no infrastructure in the southwestern parts of the park - the deep swamps, where the wildlife concentrations are.