A Mari Usque Ad Mare is the Canadian national motto. The phrase comes from the Latin Vulgate translation of Psalm 72:8 in the Bible:

"Et dominabitur a mari usque ad mare, et a flumine usque ad terminos terrae"

(King James Bible: "He shall have dominion also from sea to sea, and from the river unto the ends of the earth").

A Mari Usque ad Mare, means “From sea to sea."

More Info: wikipedia.moesalih.com