▁the ▁ 2 0 1 1 ▁local ▁government ▁reform ▁it ▁is ▁part ▁of ▁the ▁municipality ▁Al m op ia , ▁of ▁which ▁it ▁is ▁a ▁municipal ▁unit . ▁It ▁was ▁the ▁capital ▁of ▁the ▁former ▁Al m op ia ▁e par chy . ▁It ▁is ▁located ▁in ▁the ▁north west ▁corner ▁of ▁the ▁P ella ▁regional ▁unit , ▁border ing ▁the ▁southern ▁part ▁of ▁the ▁North ▁Mac ed onia ▁and ▁the ▁n ortheast ▁corner ▁of ▁the ▁Flor ina ▁regional ▁unit . ▁Its ▁land ▁area ▁is ▁. ▁The ▁population ▁of ▁Ar ida ia ▁proper ▁is ▁ 7 , 0 5 7 , ▁while ▁that ▁of ▁the ▁entire ▁municipal ▁unit ▁is ▁ 2 0 , 3 1 3 ▁( 2 0 1 1 ▁census ). ▁Its ▁largest ▁other ▁towns ▁are ▁Pr óm ach oi ▁( pop . ▁ 1 , 7 4 0 ), ▁S os ánd ra ▁( 1 , 0 7 8 ), ▁Á ps al os ▁( 1 , 1 2 1 ), ▁L out rá ki ▁( 1 , 1 4 6 ), ▁Pol yk ár pi ▁( 1 , 0 4 9 ), ▁Ts á ko i ▁( 9 6 1 ), ▁V ore in ó ▁( 7 6 6 ), ▁and ▁ Χ if ian í ▁( 7 6 7 ). ▁The ▁municipal ▁unit ▁is ▁divided ▁into ▁ 1 7 ▁communities . ▁ ▁People ▁from ▁Ar ida ia ▁▁ ▁Nik od im ▁Ts ark ni as , ▁priest ▁of ▁the ▁Mac ed onian ▁Orth odox ▁Church ▁Lou k as