Control description categories: Column C | Column D (Landforms; Rock and boulders; Water and marsh; Vegetation; Man-made features; Special items) | Column E | Column F | Column G | Column H | Special instructions

Column D indicates the feature on which the control flag is placed. These are cross-referenced
to the ISOM 2017-2 (International Specification for Orienteering Maps) and ISSprOM 2019-2
(International Specification for Sprint Orienteering Maps)
symbol or symbols used to represent
them (which are generally harmonised). Note that where a number is given it includes all symbols
beginning with that number (e.g. 509 indicates 509.1 & 509.2).

If a second control feature is required (i.e. for crossing; junction; between) then this must go in
column E. It is not permitted to place two symbols in Column D.

Water and marsh (ISOM / ISSprOM section 3.3)

Ref.SymbolNameDescriptionISOM/ ISSprOM
3.1LAKEA large area of water, normally mapped as uncrossable.301
3.2POUNDA small area of water, may be shallow or seasonal.301
3.3WATERHOLEA water-filled pit or depression.303
3.4RIVER, STREAM, WATERCOURSEA natural or artificial watercourse with either moving or standing water.301
3.5MINOR WATER CHANNEL, DITCHA natural or man made minor water channel which may contain water only intermittently.306
3.6NARROW MARSHA narrow marsh or trickle of water, too narrow to be shown on the map with the marsh symbol.309
3.7MARSHA permanently wet area with marsh vegetation.307
3.8FIRM GROUND IN MARSHA non-marshy area within a marsh, or between two marshes.307
3.9WELLA shaft containing water or a captive spring, clearly visible on the ground. Often with some form of man-made surround.311
3.10SPRINGThe source of a watercourse with a distinct outflow.312
3.11WATER TANK, WATER TROUGHA man made water container.311