Internal Linking by Cluster
Authority Islands: Designing Internal Links Around Clusters
Turn your site into a set of topic islands. Each island has a hub, clear spokes, and predictable link paths to product and pricing. That structure signals topical authority, avoids cannibalization, and moves readers toward action.
Why authority islands work
Search engines use links to discover pages and interpret relationships. When pages inside a topic link to each other in a consistent way, they look like a coherent resource rather than a pile of blogs. Readers benefit too. They get a guided path from definitions to comparison to product and pricing.
- Context improves relevance signals because closely related pages reference each other in clear language.
- Crawl efficiency improves because important URLs are closer to the homepage and receive more internal links.
- Conversion improves because your link paths route readers to solution pages and contact in fewer steps.
Google encourages descriptive internal links and logical hierarchies. See the SEO Starter Guide and sitemap overview.
The island model
One cluster becomes one island. The island has a pillar hub, several spokes, and explicit bridges to BOFU pages. Every link has a job.
Every spoke links back to the hub. Spokes link forward to solution and pricing. The hub also links to BOFU to shorten the path for ready buyers.
Create islands per cluster with SERP-based grouping. Keyword Insights gives you clean clusters and intent labels so the island shape matches what searchers want.
Anchor governance
Uncontrolled anchors cause cannibalization and mixed signals. Assign a primary anchor to each URL and a short list of supporting anchors. Use them consistently in hubs, spokes, and cross-links.
| Page type | Primary anchor | Supporting anchors | Do | Do not |
|---|---|---|---|---|
| Pillar hub | Head term of the cluster | Key variants that share intent | Use the head term in the first hub link to each spoke | Duplicate the exact anchor used for a spoke |
| Comparison | X vs Y | Compare X and Y, X or Y | Link back to hub with “back to [cluster] hub” | Use “best X” anchors which belong on listicles |
| Checklist or template | [topic] checklist | [topic] template, steps | Cross-link to “how it works” and solution | Borrow “pricing” anchors unless the page covers it |
| Solution page | [product] for [use case] | [product] features, [product] benefits | Link from spokes with clear evaluation intent | Compete with your own comparison page |
| Pricing | [product] pricing | [product] plans, cost of [product] | Add internal links from hub and solution | Use generic “learn more” anchors |
Keep a living “anchor registry” in your editorial doc. New pages get assigned anchors before publishing. This prevents drift and duplicate targets.
Link paths that convert
A good island routes people from learning to evaluating to buying. Use consistent link modules so the path is obvious on every page.
Top-of-page path
- Short intro with a “see solution” link for in-market visitors
- Breadcrumbs that reflect hub → spoke
- Sticky nav that includes the hub and BOFU
In-content path
- Contextual links to definitions, comparisons, and how-it-works
- One CTA block per 600–800 words to solution or pricing
- Use descriptive anchors, not “read more”
End-of-page path
- “What to read next” module that lists two spokes and one BOFU
- FAQ links to glossary and comparison articles
- Contact and demo links for ready buyers
Templates and components
Use repeatable components so internal linking is consistent across the island.
Hub template
- Definition box and quick index of spokes
- Short blurbs with primary anchors to each spoke
- Featured path to solution and pricing
- Schema: Article or CollectionPage when appropriate
Spoke template
- Intro that links back to the hub
- Contextual links to related spokes by stage
- CTA block that routes to solution or pricing
- FAQ with links to glossary or comparisons
Reusable modules
- Related articles filtered by cluster tag
- Mini glossary that links to definition pages
- CTA strip to solution or pricing with consistent anchor text
Clusters come first. Build your component logic to show links from the same cluster by default. Use Keyword Insights cluster tags to drive these modules.
QA and cannibalization fixes
- One cluster → one URL for the primary head term. If two pages compete for the same anchors, pick a winner and 301 the other. Update internal links.
- Anchor audit each quarter. Export all internal links, group by target, and check for duplicate primaries.
- Title and H1 audits after big launches. Make sure split pages have distinct phrasing and serve different intents.
- Bridge links between islands only when there is a clear reader need. Use branded or generic anchors to avoid intent collision.
Measurement and dashboards
Judge success at the island level. If the hub and spokes rise together and more visitors take the path to BOFU, your structure is working.
| Metric | How to track | Target |
|---|---|---|
| Rank distribution by cluster | Share of queries in top 3, top 10, top 20 | Up and to the right over 8–12 weeks |
| Internal path clicks | Hub → spoke and spoke → BOFU click rates | Steady month-over-month gains |
| Assisted conversions | Sessions that include hub/spoke before BOFU | Growth that matches new publishing cadence |
| Depth and time on page | Spokes with strong in-content links should rise | Lift vs previous template |
FAQ
How many spokes per island
Four to eight works for most topics. If you have more, split into sub-islands with their own hubs and keep cross-links light.
Should I nofollow internal links
No. Internal links guide users and crawlers. Use descriptive anchors and a clean hierarchy instead of nofollow for sculpting.
What if two islands overlap
Pick a canonical owner for the shared concept. Link from the secondary island with a branded or generic anchor and avoid repeating the primary anchor.
Can a spoke outrank the hub
Yes for specific queries. That is fine. The hub holds the island together and should still receive the most internal links.