Related by context. Frequent words. (Click for all words.) 63 river deltas 60 deltas 56 geomorphology 55 escarpments 55 riverine 55 landforms 54 ecologically fragile 54 alluvial deposits 54 landmasses 54 biodiversity hotspot 53 ecologies 53 calcareous 53 fluvial 52 estuarine 51 temperate forests 51 limestone caves 51 ecological degradation 51 biodiversity hotspots 51 mangrove forests 51 biologically diverse 51 biodiverse 51 coastal ecosystems 51 intertidal 51 Brahmaputra River 50 topographically 50 ecosystems 50 fertile plains 50 deep gorges 50 depositional 50 archipelagic 50 mangrove swamps 50 headwater 50 fragile ecology 50 hydrological 49 seagrasses 49 Tibetan Plateau 49 graben 49 glaciated 49 glacial lakes 49 Sunderbans 49 bio diversity 49 freshwater ecosystems 49 river valleys 49 landform 49 Mahanadi 49 semi arid 49 glacial melt 49 marine sediments 49 planktonic 48 rivers 48 Indus river 48 mangroves 48 biota 48 sediments 48 species extinctions 48 limestone formations 48 Tungabhadra 48 topography 48 Sundarbans 48 sedimentary basins 48 Paleocene 48 Ghaggar 48 siltation 48 glacial retreat 48 biogeochemical 48 freshwater wetlands 48 lowland forests 48 marshy 48 basaltic 48 evergreen forests 48 Palk Bay 47 volcanic islands 47 embankments 47 karst 47 marine biodiversity 47 arid lands 47 stromatolites 47 rainfed 47 drainage basins 47 drylands 47 coral atolls 47 lithosphere 47 riparian 47 deep ravines 47 Chilika 47 Qinghai Tibet Plateau 47 silting 47 river embankments 47 breccia zones 47 fertile lands 47 cultivable 47 archipelagos 47 limestones 47 tidal creeks 46 sparsely inhabited 46 basalts 46 floodplains 46 coastal 46 Dhamra 46 coastal estuaries 46 terrestrial ecosystems