Related by context. Frequent words. (Click for all words.) 52 IWRM 50 cryosphere 49 trans boundary 49 transboundary 48 biodiversity hotspots 48 glacial lakes 48 glacier melt 47 Polar Regions 47 biogeochemical 47 freshwater ecosystems 46 ecologies 46 flora fauna 46 watersheds 46 hydrological 46 biodiversity hotspot 46 ecosystems 45 geomorphology 45 biodiversity conservation 45 aquatic ecosystems 45 Soil erosion 45 headwater 44 aquatic ecosystem 44 deplete oxygen 44 headwater streams 43 biodiversity 43 conserve biodiversity 43 seamounts 43 aquatic habitats 43 freshwater 42 ecology 42 river basin 42 biota 42 terrestrial ecosystems 42 Amazon Rainforest 42 river basins 42 biomes 42 hydrology 42 coastal ecosystems 42 biologically diverse 42 glacial melt 42 landforms 41 river deltas 41 drylands 41 glaciology 41 bio diversity 41 biosphere 41 irrigated agriculture 41 biogeochemistry 41 freshwater lakes 41 forest ecosystems 41 glaciers 41 Namib Desert 41 hydrogeology 40 boreal 40 Himalayas 40 freshwater ponds 40 tidal marshes 40 fragile ecology 40 Remote sensing 40 mussel species 40 Lake Atitlan 40 headwaters 40 Watersheds 39 rivers lakes 39 hydro electric dams 39 lakes 39 freshwater wetlands 39 ecological 39 temperate forests 39 climate change 39 Stormwater runoff 39 habitats 39 wetland restoration 39 fragile ecosystems 39 karst 39 groundwater basins 39 Danube Delta 39 Salinity 39 lakes rivers 39 landform 39 aquifer recharge 39 hydrological cycle 39 landmasses 39 marine ecosystems 39 semi arid 39 wildlife habitats 39 Everglades ecosystem 39 riparian buffers 39 Great Artesian Basin 38 Global Earth Observation 38 hydropower 38 keystone species 38 ecological degradation 38 habitat restoration 38 tributary streams 38 ecosystem 38 biodiverse 38 seagrasses 38 Bangladesh Bhutan India 38 fluvial 38 lakeshores