Real estate is one of the fundamental pillars of the law of property, and issues that arise here often involve property boundaries. The boundaries of a property are normally divided into three categories: boundaries on land, in watercourses and at sea.
Land boundaries are determined by land survey. Today this is achieved by identifying the coordinates of boundary points with an extremely high degree of precision. In the past the measurements were not always so precise. It can often be challenging to locate old boundary markers, and even determine what actually denotes the boundary marker. In these situations, land consolidation courts often possess particular expertise in locating boundary markers based on their knowledge of traditional practices, the topography of the terrain, and the natural markers used when determining boundaries.
A consequence of older land surveys may be that the boundary markers are imprecisely indicated in the original divisional or land tax partition proceedings, such that the actual boundary markers are otherwise positioned. A situation may often be complicated by the presence of physical barriers that disrupt the original boundary lines. Such situations can make prescriptive rules relevant, for example when a fence, wrongly positioned over many years, has resulted in the owner within the wrongly positioned fence exercising his prescriptive right to the area involved. There are Supreme Court cases that deal with such questions, though a very strict requirement of due care is necessary when exercising a prescriptive right.
Boundaries in watercourses differ from those at sea, in that river beds and banks are entirely subject to private property law. This is also the case for lakes, with the exception of larger lakes that contain a so-called “free central area”. Watercourses often represent considerable assets, for example in the form of waterfall rights, or fishing rights in an attractive salmon river.
A river frequently marks the boundary between two properties on either side of it, and the main rule here is that the boundary runs along the “deep line”, i.e., the deepest channel in the river. When determining the boundary between two properties on the same side of a watercourse, the main rule is that the land at the bottom of the watercourse belongs to the shoreline that is nearest to it at low water.
Boundaries at sea will, as far as relations between neighbouring properties is concerned, mainly follow the same principles as for watercourses, with the difference that it is the median water level which is applied when determining which shoreline is nearest the seabed location in question. In bays and creeks in the Norwegian archipelago this can often give rise to some problematical boundary demarcations.
Boundaries out at sea are often more easily delineated, as the main rule in Norwegian law is that ownership at sea is determined by the steep underwater shelf. Sea limits are especially relevant for rights of access by sea, as well as for bathing and leisure opportunities.