Related by context. Frequent words. (Click for all words.) 51 mountainous frontier 49 porous frontier 48 semiautonomous tribal 46 jagged mountains 45 Philadelphi corridor 44 largely ungoverned 44 regions bordering 44 rugged mountains 44 arid Sahel region 44 Hashemite kingdom 44 Arctic archipelago 43 Philadelphi Corridor 43 Euphrates valley 43 Cukurca 43 insurgent safe havens 43 Caspian basin 43 Chari River 43 canyonlands 43 Pasayten Wilderness 43 Mexico Baja peninsula 42 longest undefended border 42 rugged cliffs 42 Houthi fighters 42 Prevailing winds 42 rugged canyons 42 heliopause 42 NKorea vows 42 semiautonomous tribal regions 42 surface bulk tonnage 42 semiautonomous tribal region 42 militant sanctuaries 42 Bajaur tribal 41 Baluchistan provinces 41 Demilitarized Zone DMZ 41 separatist enclaves 41 sparsely inhabited 41 tribal regions 41 Philadelphi Route 41 Hezbollah guerillas 41 Huthi rebels 41 Sinai Peninsula 41 Pamir Mountains 41 Aksai Chin 41 Korangal Valley 41 Qandil mountains 41 Senkaku islands 41 Kurdish separatism 41 rugged mountainous region 41 Mona Passage 41 geologically prospective 41 Control LOC 41 towering peaks 41 Gurez sector 41 steep canyon 41 Tibetan plateau 40 Rocky Mountain foothills 40 Smuggler Gulch 40 Hawaii Guam Micronesia 40 escarpments 40 Spratly islands 40 Khalis Shiite 40 overland routes 40 wooded slopes 40 Indonesian archipelago 40 sunken hull 40 disputed Falkland Islands 40 Security Zone TSZ 40 Caspian Sea 40 Eyjafjoell volcano 40 de facto annexation 40 Strong quake jolts 40 rugged canyon 40 brushland 40 battling resurgent Taliban 40 Jewish settlement blocs 40 populated areas 40 Houthi rebels 40 steep ravines 40 Arafura Sea 40 Sierra Madres 40 Taiwan Strait 40 lush valleys 39 North Pacific Gyre 39 Hizbollah fighters 39 ungoverned border 39 uninhabited islets 39 Netzarim settlement 39 border 39 Morocco annexed 39 Sunda Strait 39 buffer zone separating 39 saline aquifers 39 jagged peaks 39 sedimentary basin 39 Passamaquoddy Bay 39 Bohai Sea 39 disputed Chebaa Farms 39 Control LAC 39 Montney formation 39 Mediterranean Sea 39 technically recoverable oil