Loading the player... Covariance is a measure of the degree to which returns on two risky assets move in tandem. A positive covariance means that asset returns move together, while a negative covariance means returns move inversely.
1. Rotterdam (the Netherlands) This Dutch harbor was the largest in the world, until Shanghai and Singapore grew even larger in 1986. This satellite photo gives an indication of the size of the Port of Rotterdam. (Image via Mannlines) About an hour and a half to the south of Rotterdam is Antwerp, the largest port in Belgium.
4 miles long, the Progreso Pier is one of the longest in the world. The pier that extends from the shores of Progreso, YucatÃ¡n into the deep waters of the Gulf of Mexico is among the longest such structures in the world. Located in a port city in Mexico in the state of YucatÃ¡n, the pier was built for docking large cargo and passenger ships. The pier hasnât always reached such great lengths.