▁the ▁confl u ence ▁of ▁the ▁Le k ▁and ▁No ord ▁rivers . ▁To ▁d rain ▁the ▁pol der , ▁a ▁system ▁of ▁ 1 9 ▁wind m ills ▁was ▁built ▁around ▁ 1 7 4 0 . ▁This ▁group ▁of ▁mill s ▁is ▁the ▁largest ▁concentration ▁of ▁old ▁wind m ills ▁in ▁the ▁Netherlands . ▁The ▁wind m ills ▁of ▁Kind erd ijk ▁are ▁one ▁of ▁the ▁best - known ▁Dutch ▁tour ist ▁sites . ▁They ▁have ▁been ▁a ▁UN ES CO ▁World ▁Heritage ▁site ▁since ▁ 1 9 9 7 . ▁ ▁Et ym ology ▁ ▁The ▁name ▁Kind erd ijk ▁is ▁Dutch ▁for ▁" Children ▁di ke ". ▁During ▁the ▁Saint ▁Elizabeth ▁flo od ▁of ▁ 1 4 2 1 , ▁the ▁G rote ▁Holland se ▁Wa ard ▁flo oded , ▁but ▁the ▁Alb lass er wa ard ▁pol der ▁stayed ▁unf lo oded . ▁It ▁is ▁often ▁said ▁that ▁when ▁the ▁hor rend ous ▁storm ▁had ▁subs ided , ▁a ▁vill ager ▁went ▁to ▁the ▁di ke ▁between ▁these ▁two ▁areas ▁to ▁inspect ▁what ▁could ▁be ▁salv aged . ▁In ▁the ▁distance ▁he ▁saw ▁a ▁wooden ▁cr ad le ▁floating ▁on ▁the ▁water . ▁As ▁it ▁came ▁near er , ▁some ▁movement ▁was ▁noted , ▁and ▁upon ▁closer ▁investigation , ▁a ▁cat ▁was ▁found , ▁trying ▁to ▁keep ▁it ▁in ▁balance ▁by ▁le aping ▁back ▁and ▁forth ▁in ▁such ▁a ▁manner ▁that ▁water ▁couldn ' t ▁flo od ▁the ▁cr ad le . ▁As ▁the ▁cr ad le ▁eventually