Why were the positions of Venice and Genoa such an advantage in middle ages trade?

Venice and Genoa held strategic positions along key maritime trade routes in the Mediterranean, allowing them to control and facilitate trade between Europe and the East. Their access to the Adriatic and Ligurian Seas enabled them to establish important trading networks and maintain strong naval power. Additionally, both cities developed advanced shipbuilding techniques and established trade agreements, which further enhanced their economic dominance during the Middle Ages. This advantageous positioning made them vital hubs for commerce, culture, and the exchange of goods and ideas.