It is generally the house and land together. A comparative market analysis done by a professional would look at homes that are similar to yours for both the house and the land. Price comparisons can be drawn from this type of analysis if there is sufficient data that is current (within the last 6 months or so). As mentioned before, it is a little trickier if there are no comparative sales with as much land as you have. In this case, you would do a comparative market analysis for a house and smaller parcel of land vs other similar properties, and then add some value for the extra acres of land that you have over the comps. It is usually pretty easy to get the value of an acre of land in any specific area of the state. For the most accurate information, contact an experienced realtor who knows the market in your area.