The Oslofjord (Norwegian:Oslofjorden, English: Oslo Fjord) is an inlet in the south-east of Norway, stretching from an imaginary line between the Torbjørnskjær and Færder lighthouses and down to Langesund in the south to Oslo in the north. It is part of the Skagerrak strait, connecting the North Sea and the Kattegat sea area, which leads to the Baltic Sea. The Oslofjord is not a fjord in the geological sense - in Norwegian the term "fjord" can refer to a wide range of waterways. The bay is divided into the inner (indre) and outer (ytre) Oslofjord at the point of the 17 by 1 kilometre (10.56 by 0.62 mi) Drøbak Sound.