Den Helder is a Dutch municipality and port located in the northwestern region of the country. It is situated at the northern end of the North Holland Canal and is opposite Texel Island on the Marsdiep, which is a channel that links the North Sea and Waddenzee. Den Helder is a historically significant location that has witnessed several important events over the years. In 1673, a Dutch fleet led by Admiral Michiel A. de Ruyter and Cornelis Tromp defeated an Anglo-French fleet in a battle that took place offshore. Later, in 1794, a French cavalry troop captured a Dutch fleet that was trapped in ice in the Marsdiep. In 1799, the Russo-British troop landing took place in Den Helder. This marked the beginning of a failed campaign to overthrow the Batavian Republic. Den Helder was originally a fishing village. However, it was fortified by Napoleon in 1811 due to its strategic location. Later, it became the main Dutch naval base and is home to the Royal Naval College and the Admiralty Palace. The town boasts a number of well-known research institutes that are dedicated to furthering our understanding of various scientific fields. These institutes cover a range of subjects, including fishery, zoology and meteorology. Their work is essential to the advancement of our knowledge in these areas, and they are staffed by some of the most brilliant minds in the scientific community. There are also various museums and a wildlife preserve. The economy of Den Helder is based on activities such as fishing, shipbuilding, and tourism. The harbor is safeguarded by a 10-kilometer-long granite dike, which provides protection against the strong currents and waves of the North Sea.