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I don't know much about Canon cameras but are you saying there is a button or dial point for DOF ( Depth of Field ) because I've never heard of this before .
Depth of field is the amount of the image that is in sharp focus and is effected by a combination of the aperture size the focal length of your lens and the distance to the subject , in general the larger the aperture ( small f/ number ) the narrower the depth of field will be .
As wave01 said most of the time landscape photos benefit from having as much of the image in focus as pos unless you want an artistic bent to the image , so I would use aperture priority ( AV ) and set the aperture to something between f/16 and f/22 and then focus about 1/3 the way into your scene .
It might be a good idea to have a look at some of the how to videos on this site or youtube on how to use the different dial settings , another really good place to look is your cameras manual .
Mark
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