Skip to main content

204 Boulder

ISOM 2017-2
204 Boulder (ISOM 2017-2)

Geometry: point.


A distinct boulder (should be higher than 1 m), which is immediately identifiable on the ground.

Groups of boulders are represented using symbol Boulder
or a boulder field symbol (208, 209).

To be able to show the distinction between neighbouring (closer than 30 m apart) boulders with significant difference in size, it is permitted to enlarge the symbol to 0.5 mm for some of the boulders.


Footprint: 6 m diameter (7.5 m diameter).

Colour: black.

Correct examples

Incorrect examples