Related by context. Frequent words. (Click for all words.) 43 limestone cave 43 mountainous 42 tunnels dug 41 caves 40 Lavizan 40 tunnels 39 limestone caves 39 craggy mountains 39 Al Kibar 38 Dair Alzour 38 forested hills 38 Buddhist monastery 38 Parchin 38 cave 38 lava tube 38 Darkhovin 37 Tuwaitha nuclear 37 limestone formations 37 mountain 36 underground tunnels 36 Natanz uranium enrichment 35 mountainous regions 35 underground cavern 35 limestone quarry 35 mountains 35 tunneling 35 tunnel 34 excavate 34 steep canyon 34 coalmine 34 underground 34 Pelindaba 34 highlands 34 Kahuta 33 subterranean 33 Dimona reactor 33 massif 33 limestone cliffs 33 excavation 33 excavated 33 Kartchner Caverns 33 Canyon de Chelly 32 digging tunnels 32 covert uranium enrichment 32 steep cliffs 32 deep ravines 32 thick jungles 32 karst 32 alpine lakes 32 coal mine 32 centrifuge components 32 diggings 31 mountainside 31 Himalayas 31 waterfall 31 Caves 31 forested mountains 31 stalactite 31 cavern 31 Tunnel 31 lava tubes 30 jungles 30 waterfalls 30 crag 30 hot springs 30 underground bunkers 30 mineshaft 30 crags 30 prehistoric paintings 30 monastery 30 mine shafts 30 excavations 30 adits 30 ventilation shafts 30 Eldorado Canyon 30 disused railway 30 #m #ft [002] 30 extinct volcano 30 quarry 30 ancient tombs 30 overland 30 towering cliffs 30 Tunneling 30 observatory 30 Natanz enrichment plant 30 rocky outcrops 30 steep ravine 30 stilt houses 29 al Taji 29 volcanic crater 29 jungle canopy 29 hills 29 yurt 29 grottos 29 Sawtooth Mountains 29 mudflat 29 IAEA inspectors 29 underground lair 29 outcroppings 29 spokesman Hiro Ueki 29 jagged mountains