-20m Line

General Information

North Sea

Baltic Sea

Clyde Marine Region

Adriatic Sea

Eastern Mediterranean Sea

-20m Line

Layer Info
Category	Management
Sub-category	Governance
Editable	No

Description

The -20m Line represents a simplified version of the 20-meter depth contour line relative to NAP (Normaal Amsterdams Peil). This contour line marks areas where the depth is consistently 20 meters below NAP, providing important information for understanding underwater topography.

In the designated reservation areas for sand extraction, which are located west of the 20-meter depth contour line (doorgaande-20m_nap), sand mining activities are permitted. These areas have been specifically identified to manage and regulate sand extraction, ensuring that it is conducted in controlled locations to minimize environmental impact and optimize resource use.

MSP Challenge

In the MSP Challenge, this layer is not editable but it represents the border set by the government for sand extraction activities.

Sand Extraction Edition

Types

None

Metadata

Data Source

Rijkswaterstaat

Original Title

doorgaande-20m_nap

Description

The “doorgaande-20m_nap” layer represents a simplified version of the physical NAP (Normaal Amsterdams Peil) -20 meter depth contour line. This contour line indicates areas where the depth is consistently 20 meters below NAP. The physical NAP -20 meter depth line can be quite irregular due to the influence of sand transport caused by currents and waves.

Methodology

Not applicable.

Not applicable.

This layer is not available in the Baltic Sea Edition.

Not applicable.

This layer is not available in the Clyde Marine Region Edition.

Not applicable.

This layer is not available in the Adriatic Sea Edition.

Not applicable.

This layer is not present in the Eastern Mediterranean Sea.