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215 Trench

ISOM 2017-2
215 Trench (ISOM 2017-2)

Geometry: line.


Rocky or artificial trench.

Shorter trenches may be exaggerated to the minimum graphical dimension.

Impassable trenches shall be represented using symbol Impassable cliff (201).

Collapsed and easily crossable trenches should be mapped as Erosion gullies (107, 108).


Minimum depth should be 1 m.

Minimum length: 1 mm (footprint 15 m).

Colour: black.

Correct examples