Dolfinarium Harderwijk, better known as the Dolfinarium, is a marine mammal park in Harderwijk, the Netherlands. It is the largest marine mammal park in Europe. Visitor numbers were steady from 2005 to 2011, numbering between 700,000 and 800,000, with only the opening of new attractions responsible for a surge in numbers. In 2012 the Dolfinarium made €12 million in sales, which was around €2,4 million lower than the year before.