Senir - the Amorite name of Hermon, or the southern height of Anti-libanus (Deu 3:9); the Sidonian name was Sirion. “All thy ... boards”; dual in Hebrew, “double-boards,” namely, placed in a double order on the two sides of which the ship consisted [Vatablus]. Or, referring to the two sides or the two ends, the prow and the stern, which every ship has [Munster].
cedars - most suited for “masts,” from their height and durability.