Eemshaven is a seaport in the province of Groningen in the north of the Netherlands. In 1968, the Dutch government declared the Ems estuary to be an economic key region. One of the key developments for the region was the construction of a seaport called Eemshaven. The port was officially opened by Queen Juliana in 1973. Industry and shipping we…Eemshaven is a seaport in the province of Groningen in the north of the Netherlands. In 1968, the Dutch government declared the Ems estuary to be an economic key region. One of the key developments for the region was the construction of a seaport called Eemshaven. The port was officially opened by Queen Juliana in 1973. Industry and shipping were slow to develop at the site.