 Sarnia is a city in Southwestern Ontario , Canada , and had a 2011 population of 72 @,@ 366 . It is the largest city on Lake Huron and in Lambton County . Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes where Lake Huron flows into the St. Clair River , which forms the Canada @-@ United States border , directly across from Port Huron , Michigan . The city 's natural harbour first attracted the French explorer La Salle , who named the site " The Rapids " when he had horses and men pull his 45 tonnes ( 50 short tons ; 44 long tons ) barque " Le Griffon " up the almost four @-@ knot current of the St. Clair River on 23 August 1679 . 
 Sarnia <a href='drop_aux' title='1'><mark>is</mark></a>a city in Southwestern Ontario , Canada , and had a 2011 population of 72 @,@ 366 . It <a href='drop_aux' title='2'><mark>is</mark></a>the largest city on Lake Huron and in Lambton County . Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes where Lake Huron <a href='uninflect' title='3'><mark>flows</mark></a> into the St. Clair River , which <a href='uninflect' title='4'><mark>forms</mark></a> the Canada @-@ United States border , directly across from Port Huron , Michigan . The city <a href='null_genetive' title='5'><mark>'s</mark></a>natural harbour first attracted the French explorer La Salle , <a href='null_relcl' title='6'><mark>who</mark></a>named the site " The Rapids " when he had horses and men pull his 45 tonnes ( 50 short tons ; 44 long tons ) barque " Le Griffon " up the almost four @-@ knot current of the St. Clair River on 23 August 1679 . 
Sarnia a city in Southwestern Ontario , Canada , and had a 2011 population of 72 @,@ 366 . It da largest city on Lake Huron and in Lambton County . Sarnia is located on tdaeastern bank of thdaunction between thedaper and Lower Great Lakes where Lake Huron flow into the da Clair River , which form the Canada @-@ United States border , directly across from Port Huron , Michigan . The city  natural harbour first attracted the French explorer La Salle , named the sda " The Rapids " when he had horses and men pull his 45 tonnes ( 50 short tons ; 44 long tons ) barque " Le Griffon " up the almost 4 @-@ knot current of the Stdalair River on 23 August 1679 .