The pink line on your page indicates the page guides. That just indicates the "live area" where most of the type on a page will be placed, but doesn't really mean much on a photographic image like yours. The full image you show within the gray background is the trim area of the page.
If your page is going to be printed by a commercial printer, you need to create a bleed around the page which is larger than the trim area. You do this when you're creating your document by opening up the bottommost section of the New Document dialog, and adding a bleed area on all sides of the page. In North America, this is typically about 1/8 inch, but you need to find the exact amount from your printer. You should extend the photograph and any other elements which are to extend to the trim beyond to the bleed area. The bleed allows for mechanical error by the trimming equipment used in the printing process.
Here is a link to a tutorial which may help you:
Steve Werner wrote:
The pink line on your page indicates the page guides.
To clarify, those are the Margin guides that show the margins set for the page.
Thanks for the correction: Margin guides they are!