Related by context. Frequent words. (Click for all words.) 63 lake 63 freshwater lakes 60 lakes 58 barrier reef 56 freshwater 53 estuary 53 headwaters 52 wetland 51 waterway 51 freshwater fish 50 river 49 rivers 49 river basin 49 tributary 49 basin 48 biologically diverse 48 reservoir 48 wetlands 47 mangrove forest 47 Aral Sea 47 inland lakes 46 drainage basin 46 waterways 46 bird sanctuary 45 landmass 45 tributaries 45 shoreline 45 mangrove forests 45 river basins 45 toxic algae 44 Lake Sakakawea 44 mountain glaciers 44 aquifer 44 River tributary 44 Lake Baikal 44 pristine wilderness 44 wetland habitat 44 reservoirs 44 Lake 43 inland waterway 43 salmon fishery 43 trout streams 43 coral reef 43 aquatic ecosystems 43 mud flats 43 watercourse 42 Yangtze 42 dam 42 aquifers 42 River basin 42 lagoon 42 Yangtze River 42 ponds 42 Wetland 42 basins 42 lakeside 42 waterfalls 42 marsh 41 lakeshore 41 canal 41 lagoons 41 navigable 41 Reservoirs 41 mountain snowpack 41 mudflats 41 estuaries 41 tropical rainforest 41 Heritage Site 41 glaciers 41 peat bogs 41 pond 40 Indus river 40 underground aquifers 40 whitewater 40 hydroelectric dam 40 World Heritage Site 40 shorelines 40 oceans 40 beaver dam 40 fragile ecosystem 40 marshland 40 meltwater 40 lakes rivers 40 tourist attraction 40 sturgeon 40 dike 40 boreal 40 river valleys 39 arable land 39 shellfish beds 39 birdlife 39 waters 39 driest 39 greenhouse gas emitter 39 boreal forest 39 weir 39 Arctic Ocean 39 sandy beach 39 creek 39 navigable waters 39 coastal wetlands