Dave is right--you can go into Google Maps for example and correct the position of the pin on the Map. Listing agents or sellers need to adjust the maps now because they are not reliable, especially for country properties where the maps are not fully digitized, or on large parcels where the pin placement is either misleading or downright inaccurate. And you need to go to various mapping sites to effect the changes.
BTW,this is in an interesting location. It is a beautiful area between the Santa Rosa Country Club, an older development bordering the golf course and the surrounding farm properties which have vineyards, horses and livestock. All about 10 minutes to downtown Santa Rosa, or to Sebastopol, Graton or Occidental. Maybe 15-20 minutes to Healdsburg and 10 minutes to the Airport. Can you tell I like the area?