Landgrunn er stallur úr grunnsjávarseti sem liggur á milli strandlínu og landgrunnsbrúnar landa sem liggja að sjó.
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/3/32/Continental_shelf.png/320px-Continental_shelf.png)
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/9/93/Elevation.jpg/640px-Elevation.jpg)
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