Related by context. Frequent words. (Click for all words.) 65 Afar region 57 Great Rift Valley 56 Omo River 55 Orientale Province 54 Dmanisi 53 Lop Nur 52 Namib Desert 52 hominid fossils 52 Cenozoic 52 Nenets 52 extinct volcanoes 52 Ngorongoro Crater 51 Samburu 51 Kalahari desert 51 Fertile Crescent 51 dinosaur footprints 51 baobab trees 51 Afar 51 Sanaag 51 Ngorongoro 50 Mekele 50 grassy plains 50 Lava flows 50 pre Incan 50 Nimule 50 Yakut 50 semi nomadic 50 hominid species 50 Jiroft 50 Tarim Basin 50 Pamir Mountains 50 Kyzyl 50 taiga 50 Kenya Rift Valley 50 Meroe 50 Olduvai Gorge 49 Niassa 49 nomadic herdsmen 49 Palaeolithic 49 Kalahari Desert 49 Sahara desert 49 fossils 49 Peruvian Andes 48 Thar Desert 48 highlands 48 Niger Mali 48 Mount Elgon 48 Judean Desert 48 endangered mountain gorillas 48 Hittites 48 Svaneti 48 Atapuerca 48 nomadic tribe 48 Weddell Sea 48 Mongbwalu 48 ancient Mesopotamia 48 Caucasus Mountains 48 Early Cretaceous 48 Kagera 48 Gondwanaland 47 Luangwa 47 Vedeno 47 Archaean 47 Jebel Marra 47 limestone cave 47 Sahara Desert 47 Tien Shan 47 mountainous 47 Trans Mara 47 limestone caves 47 Dolpa 47 prehistoric 47 West Pokot 47 Beledweyn 47 Solukhumbu 47 Lalibela 47 Empty Quarter 47 Rift Valley 47 Late Cretaceous 47 ancient kingdoms 47 Rwenzori Mountains 47 pottery fragments 47 Foja Mountains 47 Beringia 47 Isiolo 46 Inca Empire 46 Virunga 46 Hadramut 46 Kola Peninsula 46 Tebessa 46 Volcano erupts 46 elephants giraffes 46 H. sapiens 46 Diffa 46 Ein Gedi 46 Lubero 46 Kislovodsk 46 Pibor 46 Petroglyphs 46 Ghadames 46 lowland gorillas