The flag of Rotterdam

Rotterdam

Rotterdam is the second-largest city in the Netherlands and one of the largest ports in the world. Starting as a dam on the Rotte river, Rotterdam has grown into a major international commercial centre...

, the Netherlands

Netherlands

The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

, was adopted 10 February 1949. It is a horizontal triband of green-white-green. This color combination is also found in the coat of arms of Rotterdam

Coat of arms of Rotterdam

The coat of arms of Rotterdam is the official symbol of the city of Rotterdam. It consists of a shield and has a green band of the original weapon of Wena, bisected by a white band symbolizes the Rotte, two golden lions, and four lions, two black and two red on a gold field, and the motto of...

. The ratio is 2:3.

The colors green and white are the colors of Rotterdam since the Middle Ages

Middle Ages

The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...

, but the employment of the flag of Rotterdam has varied greatly. The green refers to the Court of Wena and the white symbolizes the Rotte.