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.
The Longest Beaches in the World. Brazilâs Praia do Cassino is the Longest Beach in the World. Extending to reach around 150 miles in length, the longest beach in the world is the Praia do Cassino Beach in Brazil. This is longer than the entire coastline of New York State (127 miles) or New Jersey State (130 miles).