1.8 URL structure & internationalisationHighVerified
hreflang missing on multilingual site
What it is
No localisation signals between language versions.
Why it matters
Google may serve the wrong language/region version, harming UX and performance in each market.
How to fix it
Implement reciprocal hreflang across versions.
Impact
Medium-high for international. Direct.
Evidence
Use hreflang to signal localized versions. Google Search Central, Tell Google about localized versions (hreflang)