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.
Links from Wikitravel articles to Wikipedia articles which have a different subject conflict with the Wikitravel:External links guidelines. They are generally considered "secondary sources" and therefore should be avoided.
The traveller may not be on-line when they read a Wikitravel article, so a link to Wikipedia (or anywhere else) won't be of much use to them. Wikitravel articles should be as complete as possible in and of themselves. Essential information about a topic should be included in the Wikitravel article.
To make a link to a Wikipedia article that will appear in-line, put a colon in front of the "WikiPedia", like this: [[:WikiPedia:Article title on Wikipedia]]. In practice however, this type of link is reserved for use in pages which are not in the Main namespace.
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.