- Halden is a city and municipality in Viken county, Norway. It is located on the eastern shore of the Oslofjord, near the Swedish border. Halden is known for its historic fortress, Fredriksten Fortress, which overlooks the city and offers panoramic views. The city has a population of around 30,000 residents and is situated in a picturesque landscape with forests, lakes, and rolling hills. Halden has a rich cultural scene, with several museums, art galleries, and music festivals. It is also a popular destination for outdoor activities such as hiking, boating, and fishing. The city has a strong industrial base, with industries like manufacturing, technology, and services playing a significant role in its economy. Halden is easily accessible by road, rail, and sea, making it a convenient and attractive destination for both residents and tourists.