This is an unnamed land that was located on the Sea West shore and southward of the land Bountiful.
Commentaries (
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ALMA 24:13 [52:11]: And he also said unto him, I would come unto you, but behold, the Lamanites are upon us in the borders of the land by the west sea; and behold, I go against them, therefore I can not come unto you.
Commentary: This verse references the places of the land by the Sea West, the land northward, the narrow pass, and the Sea West. The term 'he' refers to Moroni. The term 'him' refers to Teancum. Teancum was in the land Bountiful. The land by the west sea (Sea West) is not the land Bountiful. Moroni was defending against Lamanites coming from the south, so the land by the west sea would be southward of the land Bountiful.
ALMA 24:14 [52:12]: Now the king (Ammoron) had departed out of the land of Zarahemla, and had made known unto the queen concerning the death of his brother, and had gathered together a large number of men, and had marched forth against the Nephites, on the borders by the west sea;
Commentary: This verse references the places of the land by the Sea West, the Sea West, and Zarahemla. Ammoron departed out of the land of Zarahemla and went to the Sea West. The phrase 'on the borders' means near, and not necessarily next to, the Sea West. This verse further explains the location of the land by the west sea as by the borders by the west sea.
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