Tsaunukan Laurentian, wanda kuma aka sani da Garkuwar Kanada ko Garkuwan Precambrian, yanki ne mai faɗi a gabas da tsakiyar Kanada wanda ya ƙunshi babban yanki na Quebec, Ontario, Manitoba, Saskatchewan, da sassan Nunavut da Yankunan Arewa maso Yamma. An siffanta ta da daɗaɗɗen, tsaunuka da aka fallasa, tsaunuka masu birgima, da tafkuna da koguna masu yawa, kuma babban tushen ma'adanai ne, gami da zinariya, azurfa, nickel, da tagulla. Kalmar "Laurentian" tana nufin kogin St. Lawrence, wanda ke ratsa yankin, yayin da "Highlands" ke nufin wurin da yake da tuddai.