What is Ontario Highway 21?
{{Use mdy dates|date=May 2020}} {{Infobox road |province = ON |type = Hwy |route = 21 |alternate_name = Bluewater Highway |map = {{maplink|frame=yes|plain=yes|frame-align=center|frame-width=290|frame-height=290|frame-lat=43.749|frame-long=-81.470|zoom=7|type=line|raw={{Wikipedia:Map data/Wikipedia KML/Ontario Highway 21}}}} |map_custom = yes |map_notes = Highway 21 highlighted in red |maint = the [[Ministry of Transportation of Ontario]] |established = May 23, 1927{{sfn|Whipp|1983|p=31}} |length_km = 226.8 |length_ref = |direction_a = South |terminus_a = {{jcon|Hwy|402}} near [[Wyoming, Ontario|Wyoming]] |junction = {{jcon|Hwy|8}} in [[Goderich, Ontario|Goderich]]<br>{{jcon|Hwy|9}} in [[Kincardine, Ontario|Kincardine]] |direction_b = North |terminus_b = {{jcon|Hwy|6|con=10|con2=26}} in [[Owen Sound]] |cities = [[Grand Bend, Ontario|Grand Bend]], [[Goderich, Ontario|Goderich]], [[Kincardine, Ontario|Kincardine]], [[Southampton, Ontario|Southampton]], [[Port Elgin, Ontario|Port Elgin]], [[Owen Sound]] |previous_type = ON |previous_route = 20 |next_type = ON |next_route = 23 |browse = {{ON former|next=22}} }} '''Ontario Highway 21''', also called '''King's Highway 21''', is a [[Province|provincial]] [[highway]] in southwestern [[Ontario]], [[Canada]]. It starts near [[Ontario Highway 402]], almost half way between [[Sarnia]] and [[London, Ontario|London]]. It runs north/northeast for {{convert|227|km}} and ends in [[Owen Sound]] with [[Ontario Highway 6|Highway 6]], [[Ontario Highway 10|Highway 10]], and [[Ontario Highway 26|Highway 26]].<ref name=Bevers>{{cite web |url=http://www.thekingshighway.ca/Highway21.htm |title=History of King's Highway 21 |author=Cameron Bevers|date=n.d.|website= |publisher=The King's Highway.ca |accessdate=October 12, 2014}}</ref> The roadway is referred to as the '''Bluewater Highway''' because it remains very close to the eastern shoreline of [[Lake Huron]].<ref>Alan Tucker,