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This is apparently an allusion to the fleets of sailing ships which brought untold riches to Palestine ("the land which We had blessed") and made Solomon’s wealth proverbial.
Cf. xxxiv. 12, and xxxviii. 36-38, This has been interpreted to mean that Solomon had miraculous power over the winds, and he could make them obey his order. In any case the power behind was, and is, from Allah, Who has granted man intelligence and the faculties by which he can tame the more unruly forces of nature.
Evidently Palestine, in which was Solomon's capital, though his influence extended for north in Syria.