Lent Township is located in western Chisago County and is bordered by Isanti and Anoka counties to the west, the cities of Stacy, Wyoming, and Chisago City to the south, Chisago Lake Township to the east, and the city of North Branch to the north.
According to the United States Census Bureau, the township has a total area of , of which is land and , or 5.74%, is water [REF].