g olas , ▁while ▁in land , ▁around ▁the ▁town ▁of ▁Bal m ased a ▁they ▁are ▁on ▁tre ll ises ▁( en ▁esp al der a ). ▁ ▁V ine y ards ▁The ▁v ine y ards ▁are ▁plant ed ▁along ▁the ▁coast ▁and ▁the ▁banks ▁of ▁the ▁est u ary , ▁both ▁to ▁the ▁east ▁and ▁to ▁the ▁west ▁of ▁Bil ba o , ▁the ▁provincial ▁capital . ▁There ▁are ▁two ▁main ▁traditional ▁areas : ▁Bak io ▁on ▁the ▁coast ▁and ▁B als amed a ▁in land . ▁Most ▁of ▁the ▁v ine y ards ▁are ▁small ▁and ▁dispers ed ▁on ▁the ▁low ▁fo oth ills ▁near ▁the ▁coast , ▁at ▁an ▁average ▁height ▁of ▁ 1 5 0 ▁m ▁above ▁sea - level . ▁ ▁The ▁so ils ▁near ▁the ▁coast ▁are ▁pre domin antly ▁cl ay ▁while ▁further ▁in land ▁it ▁is ▁more ▁varied . ▁In ▁deep ▁soil ▁areas ▁there ▁lim estone ▁and ▁mar ls ▁are ▁present . ▁The ▁shall ow ▁so ils ▁are ▁neutral ▁or ▁acid ic ▁and ▁rich ▁in ▁organ ic ▁matter . ▁▁ ▁There ▁are ▁ 2 4 0 ▁ha ▁of ▁v ine y ards ▁registered ▁with ▁the ▁D . O . ▁ ▁Perm itted ▁maximum ▁yield : ▁ 7 0 % ▁ ▁Max imum ▁author ized ▁yield : ▁ 1 3 , 0 0 0   kg / ha ▁ ▁Perm itted ▁alco hol ▁content : ▁▁ 1 1 . 5 % ▁( white ); ▁ 1 2 % ▁( red ) ▁ ▁Cl imate