Multiple URLs for the same page

[WebMarketingandDesign]

I am working with a client and recently discovered that they have several URLs that go to the same page.

http://www.maps.com/FunFacts.aspx
http://www.maps.com/funfacts.aspx
http://www.maps.com/FunFacts.aspx?nav=FF
http://www.maps.com/FunFacts.aspx?nav=FS
http://www.maps.com/funfacts.aspx?nav=FF
http://www.maps.com/funfacts.aspx?nav=ffhttp://www.maps.com/FunFacts.aspx?nav=MShttp://www.maps.com/funfacts.aspx?nav=
http://www.maps.com/FunFacts.aspx?nav=FF#
http://www.maps.com/FunFacts
http://www.maps.com/funfacts.aspx?.nav=FF

I am afraid this is happening all over the site. So, my question is:

Is this hurting the SEO and how?

If so what is the best way to go about fixing this problem?

Thanks for your help!

[EGOL]

Prob not a good idea to post client URLs.

[WebMarketingandDesign]

Hey, thanks guys for the great feedback!

[KeriMorgret]

Yes, it is hurting the SEO. For more information than you might ever wanted to know about this, see the comprehensive blog post that Dr. Pete (an SEOmoz associate) posted last night at http://www.seomoz.org/blog/duplicate-content-in-a-post-panda-world. That should be a good starting point to understand why you don't want this happening, and how to start to fix it. The comments touch on case sensitivity as well, even though he didn't include that in the post itself.

[sesertin]

Hello,

This is seriously hurting your seo. The best way to get it over to implement canonical links in the head section of each page, so that it will tell google which page to display in the serps. You should choose the all lovercase letter one with no .aspx ending.

[SL_SEM]

Yes this hurts SEO. Mostly in that search engines rank pages based on the URL as a the URL is the only unique identifier they have for a given page.

This means link popularity is split amongst the URLs and the same page is competing with its self to rank so Google usually picks one and ignores the others, and then you lose all of the link juice for links to the others.

So with that said there are multiple ways to fix this. The most useful one is to setup 301 redirects for every option and redirect the user to the one you want to use. This way even if an outside source links to one of the variations google will go through that link, hit the redirect, and see the final URL and use that for ranking. Going the 301 route also keeps your stats programs much cleaner as you won't see stats for various versions of the pages.

The hard part with 301s is catching all variations of a URL.

With that said you might have a 301 in place, but then have parameters passed to the URL often. This is where the rel=canonical tag comes in handy.

rel=canonical is a tag you can place in a page that tells anyone who cares (search bots mostly) that if you see this page at a URL other than the canonical URL you need to treat it as the same page as the canonical URL (that is a simplification, but works for the most part).

So, get 301's in place, and then in your template for each page get a rel=canonical tag setup with the base URL so you are taken care of on both fronts...

This can be rough on huge sites, but there is usually a programmatic way to do this to catch a good portion of your pages.