Wikitravel:Links to Wikipedia
Many of the articles in Wikitravel can benefit from links to Wikipedia articles on the same subject. A Wikitravel article focuses on the issues facing travelers for a destination, but Wikipedia articles can have deeper or broader information on a topic.
To add a link to a Wikipedia article on the same subject, add a link of the form [[WikiPedia:Article title on Wikipedia]].
The link will not appear in the main text of the article page on Wikitravel, but will instead show up automatically in the section "Other sites/languages" in the left-side navigation box.
Add a Wikipedia link to the very end of an article, to keep the article uncluttered. Avoid adding more than one Wikipedia link; the link you add should be to an article on exactly the same topic.
There are many Wikipedias for different languages. Linking to most of them from English-language Wikitravel doesn't make a lot of sense. After all, our target audience are English speakers who won't understand a linked article in Tamil or Estonian.
In addition, don't count on Wikipedia-style interlanguage prefixes to work for links to Wikipedia language versions. We have our own multilanguage sites here at Wikitravel, and fr:Lyon points to the French Wikitravel article about Lyon, not to the French Wikipedia article about Lyon.
If, on a policy page, a personal page or a talk page, you need to link to an article on Tagalog Wikipedia (or something similar), you can make a shortcut using the form [[:wikipedia:language code:title]]. So, the Tagalog article on Spain is at wikipedia:tl:Espanya.