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.
Sea Inlets and Straits. Duck Lagoon (Lagoa dos Patos), on the southern coast of Brazil, is a long, shallow tidal lagoon separated from the Atlantic Ocean by a wide sandbar. It covers an area of 10,153 square kilometers (3,920 square miles) and is the largest lagoon in the world.