Related by context. Frequent words. (Click for all words.) 50 Alaskan coastline 48 wolves roam 46 sparsely populated 46 lush farmland 46 pipelines 46 sparsely inhabited 46 Hetch Hetchy Reservoir 46 Marcellus shale formation 45 pump jacks 45 Ogallala Aquifer 45 Book Cliffs 44 freshwater marshes 44 irrigated farmland 44 brushland 44 Tar sands 44 rugged canyons 44 navigable rivers 44 undersea pipelines 44 thinly populated 44 underground aquifers 43 gulches 43 Maarib 43 salt domes 43 hydro electric dams 43 Wildfire burns 43 biologically diverse 43 aquifers 43 Baiji refinery 43 headwater streams 43 coulees 43 Rocky Mountains 43 Petit Bois Island 43 Beartooth Mountains 43 alpine lakes 43 headwaters 42 streambanks 42 Ghadames 42 Barnett Shale formation 42 Omo River 42 Sierra Madre mountains 42 delta 42 oil derricks 42 swamps 42 lush valleys 42 Athabasca oilsands 42 groundwater aquifers 42 kilovolt transmission lines 42 pristine wilderness 42 Suisun Marsh 42 sparsely settled 42 coastland 42 parched landscape 42 shallow aquifer 42 sequester carbon dioxide 42 underground aquifer 41 wildcatters 41 salt flats 41 miles 41 agriculturally rich 41 creek bottoms 41 isolated hamlets 41 Kuparuk 41 shale deposits 41 aspen groves 41 Sparsely populated 41 basins 41 Migrating birds 41 arid 41 natural gas 41 scrublands 41 arid plains 41 desert dunes 41 TransCanada Keystone 41 Entire towns 41 populous 41 groundwater basins 41 southcentral Alaska 41 Saboteurs blew 41 deltaic 41 chaparral covered 41 cypress swamps 40 pasturelands 40 coastal wetlands 40 largely uninhabited 40 reservoirs 40 oxbows 40 Huge swaths 40 steep ravines 40 cypress swamp 40 fragile marshlands 40 unspoiled beaches 40 grassy plains 40 mountain ranges 40 grassy meadows 40 mesquite trees 40 Caspian basin 40 unspoiled beauty 40 oilmen 40 barren desert 40 Quake jolts 40 geologic formations