WEBDec 28, 2021 · Geography - note. note 1: Chad is the largest of Africa's 16 landlocked countries note 2: not long ago - geologically speaking - what is today the Sahara was green savannah teeming with wildlife; during the African Humid Period, roughly 11,000 to 5,000 years ago, a vibrant animal community, including elephants, giraffes, hippos, and …