Related by context. Frequent words. (Click for all words.) 77 rivers lakes 66 lakes 63 waterways 59 freshwater lakes 58 rivers 56 inland lakes 53 lake 52 freshwater 50 Great Lakes basin 49 shorelines 49 estuaries 48 watersheds 48 trout streams 47 aquatic ecosystems 47 ponds 47 oceans 47 river 46 watercourses 46 inland waterways 46 lagoons 46 beaches 45 coastal waters 45 river bottoms 45 lakeshore 45 aquatic habitat 45 underground aquifers 45 unpolluted 45 groundwater 44 shoreline 44 polluted rivers 44 flora fauna 44 wetlands 44 riverbeds 44 inland waters 44 aquatic species 44 wetland 43 polluted 43 waterfalls 43 waters 43 water 43 Lake Champlain 43 aquifers 42 inland waterway 42 canals 42 Watersheds 42 streamside 42 Boundary Waters 42 toxic pollutants 42 pristine wilderness 42 aquatic organisms 42 aquatic vegetation 42 creeks 42 waterway 41 Zebra mussels 41 toxic algae 41 riverbanks 41 Lake Sakakawea 41 wildlife habitat 41 Kayakers 41 zebra mussels 41 river basin 41 boating 41 Clean Water Act 41 pollutants 41 reservoirs 41 coastlines 41 St. Croix River 41 mud flats 40 estuary 40 tributaries 40 watercourse 40 trout fishing 40 freshwater lake 40 unspoiled 40 Lake Winnebago 40 Groundwater 40 woodlands 40 boating accidents 40 recreational boating 40 saltwater 40 navigable waters 40 scenic beauty 40 Polluted 40 wildlife habitats 40 marsh 39 creek 39 estuarine 39 Snowmobilers 39 navigable 39 nutrient pollution 39 waterfronts 39 roadways 39 meadows 39 sloughs 39 contaminants 39 fishable 39 Athabasca River 39 headwaters 39 algae blooms 39 wildlife 39 hiking trails