The forest map, newly colored to describe borders, shows the ThunderClan/RiverClan border at the river, giving ThunderClan one of the banks of the river, when the books place that border at the treeline.
The books feature includes section on different warriors book arcs. When you click on a book, it leads you to that book's HarperCollins page, where there is a browse inside feature.
Meet Erin Hunter
This section includes short introductions Erin Hunter, of each of the 4 Erins themselves; Kate, Cherith, Vicky, and Tui.
Official website in German language; in the form of a wiki.
German language official site, maintained by Verlagsgruppe Beltz (publishers of the German translations).
The site has it's own forums on news, Warrior Cats, and off-topic forums, similar to this Wiki's.
There are different forums for different topics; which have moderators, and sometimes sub-forums. The different topics are on:
Discuss Warrior Cats Books (German Versions)
Discuss Warrior Cats Books (English Versions)
Polls to give your opinions on the series
Videos; fan videos made by the Warriors Community
This site has a list of the Warriors books that have been published in German so far. 
Each book has the following information listed:
Link to sample
The book's blurb
This site has biographies on the four authors of the Warriors series, including: 
This site includes a form to sign up for a Warriors newsletter.
This site includes a Frequently Asked Questions section, which is regularly updated. It had an email listed that can be used to ask a question to Beltz. This also contains a form for readers to report mistakes they found in the books. 
This site is a wiki with articles that are created and edited by fans. 
Games and quiz
A quiz about herbs
A warrior cats memory game on the site which scenes from covers of the German Warriors books
A quiz in which you have to assign the shown cat to their clan
A quiz about The Prophecies Begin arc
A quiz in which a quote from the books is shown and you have to say which cat and book the quote comes from
A game in which you are asked questions and which tells you afterwards if you would be a warrior or a medicine cat 
Ideas and tips for people who want to present a warrior cats book at their book presentation in school 
Ideas and work sheets for teachers who want to use Into the Wild in their lessons 
This site has a downloads section, in which the following items can be downloaded: 
A site devoted to getting kids to read, and getting kids to help younger kids learn to read. A few features are two short stories, Spottedleaf's Honest Answer, and one about Tigerstar, and what a great warrior he was. It also has crosswords, word searches, and other small things. It includes a "reading challenge" to become a "reading warrior." However, the site is currently shut down.
This activity is similar to Consult StarClan for your Warrior Name, except that you take a quiz, and the answers will result in the warriors "clan" where you would belong in. The possible clans that you can be in are ThunderClan, ShadowClan, WindClan, or RiverClan.Go here to take the quiz!
Decorate a Sign to Mark Your Territory
In this activity, you choose a certain place where you will read in peace and comfort.
When you've chosen the spot, you print out a reading warrior sign, from here, and once you've printed it out, you can decorate it. Then you can hang up the sign in your "special territory", so others know that you're a reading warrior.
Create Your Own Reading Warriors Journal
Print out a Warriors reading journal template here, and then color it in and personalize it.
A more colorful version of the official Harper Collins site; for children. This is the place to go to find First Look offers and suchlike for the Warriors Series, along with summaries and browse insides of most of the books.
The online home of Kate. Features a section devoted to warriors that includes things like Frequently Asked Questions, and the Occasionally Asked Questions (which update weekly). Kate Cary calls the Warriors part of her site "BlogClan."
The Warriors section of her site includes polls, her blog (BlogClan), a short bio about Kate, and fanfiction. People may leave comments on her website. She now calls herself Cakestar there because of what a fan posted.