Rivers of White Space
A river is a conspicuous vertical or diagonal path formed by aligned word spaces across neighboring lines.
RIVERDefinition
Rivers are most common in justified text when word-space expansion aligns across lines. Their visibility depends on measure, typeface, spacing, line length, and the reader’s perception.
BAD vs GOOD
Words open across a line more gaps align below and form a pale channel
Word spaces vary naturally and no continuous white channel dominates the paragraph.
Why it matters
A strong river can pull the eye away from the reading direction and make a text block look uneven.
Rule strength
Visual composition heuristic. This is not an absolute linguistic law; locale, genre, content, and house style can change the correct decision.
Exceptions and editorial considerations
- A detector can find geometric candidates that are not visually salient.
- Short samples and intentionally expressive layouts may not benefit from correction.
How to fix it manually
- Inspect at normal reading size and in print/PDF proof.
- Review justification ranges and the paragraph composer.
- Adjust measure, hyphenation, copy, or local composition only within approved limits.
Adobe InDesign guidance
Adobe Paragraph Composer evaluates the paragraph as a whole and can distribute spacing differently from Single-line Composer. Compare results before applying local tracking.
How Avellio detects it
Avellio emits RIVER by evaluating aligned inter-word spaces across consecutive composed lines. The check is geometry-intensive and should be used selectively.
Manual visual review only.
Language and locale differences
This principle has no separate Avellio locale override in the current registry; composition and house style can still affect judgment.
Authoritative references
- Avellio User Manual — Complete issue identifier referenceAvellio product source
- Adobe InDesign — Set text compositionAdobe documentation
Avellio references document product behavior. External standards and authorities support the general or locale-specific typographic guidance. Where traditions disagree, this page states the disagreement instead of manufacturing one universal rule.