Groningen is the north-eastern Province of the Netherlands. In the east it borders the German state of the Niedersachsen, in the south the Province of Drenthe, in the west the Province of Friesland and in the north the Wadden Sea. The land is mainly used for agriculture. There are two seaports in Delfzijl and Eemshaven. The Groningen gas field was discovered in 1959 and is the largest natural-gas field in Europe and the tenth largest in the world. This gas field produces 50% of natural gas in the Netherlands. There are two universities in Groningen city – the University of Groningen and Hanze University of Applied Sciences.