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206 Gigantic boulder or rock pillar

ISOM 2017-2
206 Gigantic boulder or rock pillar (ISOM 2017-2)

Geometry: area.


A gigantic boulder, rock pillar or massive cliff shall be represented in plan shape. The objects can vary in shape and width.

The gap between gigantic boulders or between gigantic boulders and other impassable feature symbols must exceed 0.15 mm on the map


Minimum width: 0.25 mm (footprint 3.75 m).

Minimum area: 0.3 mm² (footprint 67 m²).

Colour: black.


The definition of this map symbol was updated on 16.09.2022: Correction of minimum size: 0.3 –> 0.25

Correct examples