Sofia Valley
The Sofia Valley ( , or Софийско поле , "Sofiysko pole" ) is a valley in central western Bulgaria bordering Stara Planina to the northeast , the Viskyar , Lyulin , Vitosha and Lozen mountains to the southwest , the Vakarel Mountain to the southeast and the low Slivnitsa Heights to the northwest . 
<triplet> Sofia Valley <subj> Bulgaria <obj> country