Alma 8:3

And it came to pass in the commencement of the tenth year of the reign of the Judges over the people of Nephi, that Alma departed from thence, and took his journey over into the land of Melek, on the west of the river Sidon, on the west, by the borders of the wilderness;

At the start of the tenth year, Alma left home. He traveled to the land of Melek. It was west of the Sidon River, by the edge of the wild lands.

Early in the tenth year, Alma left and traveled to the land of Melek, west of the Sidon River near the wilderness border.