s ▁Category : I r ish ▁gene al ogy ▁Category : I r ish - language ▁literature ▁Category : 1 4 th - century ▁documents ▁Category : 1 3 4 0 s ▁works ▁Category : 1 4 th - century ▁manuscript s ▁Category : Med ieval ▁gene alog ies ▁and ▁succession ▁lists ▁Category : I r ish ▁books ▁Category : 1 3 4 0 s ▁in ▁Ireland <0x0A> </s> ▁The ▁Town ▁of ▁Grand ▁Valley ▁( former ly ▁The ▁Township ▁of ▁East ▁Luther ▁Grand ▁Valley ) ▁is ▁a ▁town ship ▁in ▁the ▁Canadian ▁province ▁of ▁Ontario , ▁composed ▁of ▁the ▁former ▁Township ▁of ▁East ▁Luther ▁and ▁the ▁former ▁Village ▁of ▁Grand ▁Valley . ▁The ▁town ship ▁is ▁located ▁within ▁D uffer in ▁County , ▁and ▁includes ▁part ▁of ▁the ▁Luther ▁Marsh . ▁ ▁The ▁mar sh ▁covers ▁over ▁ 1 0 , 0 0 0 ▁acres ▁( 4 0   km ² ) ▁including ▁Luther ▁Lake . ▁The ▁Grand ▁River ▁is ▁one ▁of ▁the ▁major ▁sites ▁in ▁the ▁town . ▁ ▁Geography ▁ ▁The ▁town ship ' s ▁northern ▁limit ▁is ▁Highway ▁ 1 0 ▁and ▁Highway ▁ 8 9 ; ▁north ▁of ▁the ▁limit ▁is ▁the ▁town ship ▁of ▁Mel an ct hon . ▁ ▁The ▁town ship ' s ▁southern ▁limit ▁is ▁D uffer in ▁County ▁Road ▁ 1 0 9 ; ▁south ▁of ▁the ▁limit ▁is ▁the ▁town ship ▁of ▁East ▁Gar af ra xa . ▁ ▁The ▁town ship ' s ▁eastern ▁limit ▁is ▁Am ar anth - E ast