Datasets · Geology
Marine border, already linked to every property.
The geographical line that marks the highest level the sea reached after the last ice age: a fundamental geological divide that determines where marine sediments (including marine clay and potential quick clay) can be found. The dataset comes from the Geological Survey of Norway (NGU), and Geodata AS distributes it to Placepoint.
What the dataset contains
Marine border in Placepoint
The geographical line that marks the highest level the sea reached after the last ice age: a fundamental geological divide that determines where marine sediments (including marine clay and potential quick clay) can be found. The dataset comes from the Geological Survey of Norway (NGU), and Geodata AS distributes it to Placepoint.
In practice: below the marine border, quick clay and marine landslides can occur. Above it, these issues are ruled out. This is crucial information for municipal planning and development in parts of the country with a former higher sea level, especially in Østlandet, in Trøndelag and around some fjord heads. The dataset is also used in groundwater and hydrogeological assessments, because marine clay can limit the extent of aquifers and relict salt water may affect water quality below the line. Read it together with Bedrock, Loose masses, Possibility of marine clay and Quick clay. Part of the Geology map layers.
This text is based on the dataset documentation, synced 16 October 2026.
What it looks like
Marine border on the map
The dataset is part of the map layer Geology:
More in the Geology map layer
Datasets often read together
Bedrock, derived maps, NiN
Derived bedrock maps from NGU for Natur i Norge: forecast for lime content in the bedrock and the extent of ultramafic rocks.
About the datasetBedrock N250
The map data is mainly based on the national printed bedrock geology map series at a scale of 1:250,000, and has since been harmonised across map sheet boundaries and updated with newer map data.
About the datasetBedrock N50
The maps are built on a combined interpretation of field observations, geophysical data, digital elevation models and aerial photos, along with analyses of collected samples.
About the datasetMining rights
Areas covered by mining rights for state-owned minerals under the Minerals Act: exploration rights (UN) and extraction rights (UT).
About the datasetDrill cores
NGU's drill core archive: places where drill cores have been taken for bedrock, natural stone, metals and industrial minerals.
About the datasetGeochemistry
NGU's national geochemical database: field samples of loose masses, stream sediments and water with analysed elements, and measurement points with geochemical measurements.
About the datasetHow often is the marine border updated?
Monthly. The frequency follows the source and is shown on the dataset in Placepoint.
Where does the data come from?
From Geodata AS. We collect and quality-check the data and place it on the correct property, with source and date on every field.
How do I see the marine border on a property?
Look up the address in Fusion and turn on the Geology map layer. The dataset is there as its own layer, and the details appear in the property panel when you click on the map.
Can I get the dataset programmatically?
Yes. The same data is available in Placepoint API and in Placepoint AI through MCP, so you can bring it into your own systems and agents.
Used where decisions really matter
