How to create a "viewport" with Markup/XAML?

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   The setting is that I have a large image displayed in a markup control with a an Image-tag. I would like to display only a portion of it by using a "viewport" (in lack of a better word). 
I'll try to illustrate this below, where you see the view port focusing on a part of the larger image;

The viewport itself only displays what the coordinates specifies, and would look like this;

I have tried to fiddle around with the XAML-elements Canvas, ScrollViewer, Viewbox and Image, but with no current success yet. Somehow I feel that the attributes ClipToBound on Image could be useful, but I seem to lack something like VerticalOffset and HorizontalOffset combined with Height and Width.

Does anybody have any ideas on how to create a viewport?