What is Charles River?
{{Infobox river | name = Charles River | name_native = | name_native_lang = | name_other = | name_etymology = <!---------------------- IMAGE & MAP --> | image = Longfellow pru.jpg | image_caption = The [[Longfellow Bridge]] crossing over the Charles River, connecting [[Boston]] and [[Cambridge, Massachusetts|Cambridge]], in winter | map = Charlesrivermap.png | map_size = 300 | map_caption = Charles, Mystic, and Neponset river watersheds | pushpin_map = | pushpin_map_size = 300 | pushpin_map_caption= <!---------------------- LOCATION --> | subdivision_type1 = Country | subdivision_name1 = United States | subdivision_type2 = State | subdivision_name2 = Massachusetts | subdivision_type3 = | subdivision_name3 = | subdivision_type4 = | subdivision_name4 = | subdivision_type5 = Cities | subdivision_name5 = [[Hopkinton, Massachusetts|Hopkinton]], [[Cambridge, Massachusetts|Cambridge]], [[Boston, Massachusetts|Boston]] <!---------------------- PHYSICAL CHARACTERISTICS --> | length = {{convert|80|mi|km|abbr=on}} | width_min = | width_avg = | width_max = | depth_min = | depth_avg = | depth_max = | discharge1_location= | discharge1_min = {{convert|0.1|cuft/s|m3/s|abbr=on}} | discharge1_avg = {{convert|302|cuft/s|m3/s|abbr=on}} | discharge1_max = {{convert|4150|cuft/s|m3/s|abbr=on}} <!---------------------- BASIN FEATURES --> | source1 = [[Echo Lake (Hopkinton)|Echo Lake]] | source1_location = [[Hopkinton, Massachusetts|Hopkinton]], [[Massachusetts]], [[United States]] | source1_coordinates= {{coord|42|11|34|N|71|30|43|W|display=inline}} | source1_elevation = {{convert|350|ft|abbr=on}} | mouth = [[Boston Harbor]] | mouth_location = [[Boston, Massachusetts|Boston]], [[Massachusetts]], [[United States]] | mouth_coordinates = {{coord|42|22|14|N|71|3|13|W|display=inline,title}} | mouth_elevation =