Related by context. Frequent words. (Click for all words.) 55 biodiversity hotspots 52 biodiversity hotspot 51 biologically diverse 49 vertebrate species 49 mammal species 49 Lake Vostok 48 horned rhinos 48 landmass 47 bauxite deposits 47 trillion cubic meters 47 Lake Baikal 46 sq.km 46 opium poppy producing 46 lowland forests 46 boreal 45 amphibian species 45 invertebrate species 45 dinosaur footprints 45 sq kms 45 technically recoverable 44 biosphere reserve 44 Burgess Shale 44 Arctic permafrost 43 atmospheric methane 43 #km# [004] 43 mountain glaciers 43 sq km 43 km ² 43 best sailfishing 43 rarest birds 43 Greatest Adventures 42 boreal forest 42 Kola Peninsula 42 sqkm 42 Amur tiger 42 Amur tigers 42 western lowland gorillas 42 overall CBBER 42 Qinghai Tibet Plateau 42 #sq km [003] 42 driest continent 42 oceanic crust 42 Tarim Basin 41 sq.km. 41 geologically active 41 retreating glaciers 41 terrestrial ecosystems 41 illicit opium 41 cu meters 41 Arctic seabed 41 sedimentary basins 41 boreal forests 41 marine biodiversity 41 breathtaking landscapes 41 km2 41 methane hydrate 41 sq. kilometers 41 mud volcanoes 41 trln usd 41 Antarctic ozone 41 greenstone belts 41 Ngorongoro Crater 41 Polar Regions 40 marine sediments 40 Tcf 40 subarctic 40 continental crust 40 Arctic Ocean 40 Jurassic Coast 40 endangered primates 40 subtropical regions 40 economically recoverable 40 lbs U#O# 40 sq. km 40 #.#trn [001] 40 Thelon Basin 40 hydrocarbon reserves 40 #Mt [001] 40 beers Budweiser 40 stromatolites 40 seismically active regions 40 bauxite ore 39 species 39 Melting glaciers 39 zircons 39 Baikal 39 glaciers 39 JORC compliant 39 paleontological 39 Whale sharks 39 Permafrost 39 tcf 39 #.#Moz [004] 39 alluvial deposits 39 richest 39 Caspian basin 39 icecap 39 sq. miles 39 largest emitter 39 Titan Saturn 39 melting glacier