There are 4 National Parks for safari in the Northern Circuit.
Arusha National Park (1 Day~) : recommended for one day safari
Ngorongoro Conservation Area (1 Day~): recommended for 2-3 days safari, combined with Lake Manyara National Park or Tarangire National Park
Lake Manyara National Park (1 Day~): recommended for 2-3 days safari, combined with Ngorongoro National Park or Tarangire National Park
Tarangire National Park (1 Day ~): recommended for 2-3 days safari, combined with Ngorongoro National Park or Lake Manyara National Park
Serengeti National Park (3 Days~): recommended for more than 4 days safari: 3 days is allowed in private tour, but we recommended more than 4 days
Arusha National Park (1 Day~) : recommended for one day safari
Ngorongoro Conservation Area (1 Day~): recommended for 2-3 days safari, combined with Lake Manyara National Park or Tarangire National Park
Lake Manyara National Park (1 Day~): recommended for 2-3 days safari, combined with Ngorongoro National Park or Tarangire National Park
Tarangire National Park (1 Day ~): recommended for 2-3 days safari, combined with Ngorongoro National Park or Lake Manyara National Park
Serengeti National Park (3 Days~): recommended for more than 4 days safari: 3 days is allowed in private tour, but we recommended more than 4 days