Introduction to Oslo Fjord: Oslofjorden (Oslo Fjord in English) is located in southeastern Norway. It is one of the longest fjords along the Norwegian coast. It was originally a geosyncline formed by ice erosion, but was later submerged by rising sea levels. And formed. This is one of the most densely populated areas in Norway, and a large number of ships frequently enter and exit the port of Oslo. There are many islands in the fjord, the largest and most famous is Jeloya near Moss.