White and red are the colours of a former leader, the Bishop of Utrecht. The black castle and red stars are a memory of Coevorden standing up against the Bisshop. See Flag of Drenthe.
Blue is the symbol of IJsselmeer, from which the land of this province was taken. Green is standing for vegetation, yellow for the cornfields. The lily refers to Cornelis Lely, who designed the plans for the new land taken from IJsselmeer. See Flag of Flevoland
The flag is based on the kings of Frysia in 15th century. The colours are the same as those of the national flag of The Netherlands . The stripes and leaves of the yellow water-lily, represent the 7 districts of Friesland. See Flag of Friesland
The North Brabantian flag dates from the Middle Ages and has the highest seniority among all Dutch province flags. The colours gules and argent have been used in Brabant standards, flags and pennants since the proclamation of the County of Louvain (942 CE) during the Lotharingian period. Later, the Duchy of Brabant continued using these colours. During the Middle Ages and the centuries after, the red and white would often be used. At the end of the 18th century, the flag fell into disuse. Since 1959, the red and white checkered flag has become the official flag of the province of North Brabant. See Flag of North Brabant
The colours of the flag are similar to the colours of the coat of arms, which is a combination of the coat of arms from Holland and West Friesland. see Flag of North Holland
The yellow and red stripes are a reference to the former association of this province with Holland. The blue source in the middle stands for the river IJssel, which gave the province its name. See Flag of Overijssel
In the middle of the flag, the coat of arms of the province is seen. The blue waves stand for the sea, and efforts to subdue its strength. The lion is a symbol for the winner of this battle between man and sea. See Flag of Zeeland
. The stripes and leaves of the yellow water-lily, represent the 7 districts of Friesland. See Flag of Friesland
with red and blue in the flag of the area around Groningen 
. See Flag of Groningen
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. see Flag of North Holland
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