Japanese map symbol for perennial snow

A stippled patch marking permanent snow.

Also known as: Mannenyuki mark, Permanent snowfield mark

In Japanese:: 万年雪
In Japanese (Latin):: mannenyuki

Maps & navigationStandard profile

Meanings

Denotes snow that persists through the summer on a Japanese topographic map.

Officially standardisedVerified fact
Marks snow that persists through the summer on a GSI topographic sheet.
Contexts: Maps
Officially standardisedVerified fact
Is drawn with a soft border because the feature's edge genuinely moves between years, and a hard line would assert a precision the survey does not have.
Contexts: Maps

Visual description

An irregular area filled with small scattered dots, its border drawn as a soft rather than a hard line.

Symmetry: none
Orientation: upright

Confidence

IdentityModerate confidence: Moderate confidence because the identity is documented in encyclopedic references, but only a single source has been found so far.
Historical originLow confidence: Low confidence because the historical origin is documented in encyclopedic references, but only a single source has been found so far, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useModerate confidence: Moderate confidence because the current use is documented in encyclopedic references, but only a single source has been found so far.
Visual matchModerate confidence: Moderate confidence because the visual match is documented in encyclopedic references, but only a single source has been found so far.

Sources

Map symbols used on Japanese topographic maps
Geospatial Information Authority of Japan (GSI) · retrieved 2026-08-23
Japan's national mapping agency's own published legend. Cited for the form and meaning of a symbol on Japanese topographic maps; the historical origin of individual symbols is cited separately where claimed.

Last reviewed 2026-08-26

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Japanese topographic map symbols

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Meanings

Denotes snow that persists through the summer on a Japanese topographic map.

Officially standardisedVerified fact

Marks snow that persists through the summer on a GSI topographic sheet.

Contexts: Maps

Officially standardisedVerified fact

Is drawn with a soft border because the feature's edge genuinely moves between years, and a hard line would assert a precision the survey does not have.

Contexts: Maps

Confidence

IdentityModerate confidence: Moderate confidence because the identity is documented in encyclopedic references, but only a single source has been found so far.
Historical originLow confidence: Low confidence because the historical origin is documented in encyclopedic references, but only a single source has been found so far, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useModerate confidence: Moderate confidence because the current use is documented in encyclopedic references, but only a single source has been found so far.
Visual matchModerate confidence: Moderate confidence because the visual match is documented in encyclopedic references, but only a single source has been found so far.

Sources

Map symbols used on Japanese topographic maps
Geospatial Information Authority of Japan (GSI) · retrieved 2026-08-23
Japan's national mapping agency's own published legend. Cited for the form and meaning of a symbol on Japanese topographic maps; the historical origin of individual symbols is cited separately where claimed.

Last reviewed 2026-08-26