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.
Drone Captures Jaw-Dropping Footage Inside Hang Son Doong, The World's Largest Cave. Hang Son Doong in Vietnam is the largest cave in the world. It's more than 5.5 miles long, comes complete with its own jungle and river and is so gargantuan that it could apparently hold an entire block of 40-story skyscrapers within its walls.