8 1 2 ▁New ▁Madrid ▁earth qu ake , ▁a ▁historic ▁earth qu ake ▁in ▁the ▁United ▁States ▁that ▁caused ▁the ▁Mississippi ▁River ▁to ▁flow ▁backwards ▁tempor arily ▁ ▁T idal ▁race ▁ ▁Ton lé ▁S ap , ▁a ▁lake ▁and ▁river ▁system ▁in ▁Camb odia ▁where ▁mon so on ▁flo oding ▁can ▁cause ▁the ▁river ▁to ▁flow ▁backwards ▁tempor arily ▁al beit ▁not ▁as ▁a ▁tid al ▁bore ▁ ▁References ▁ ▁External ▁links ▁▁ ▁Information ▁about ▁The ▁Se vern ▁bore , ▁UK ▁ ▁Am ateur ▁video ▁of ▁the ▁" W ig gen hall ▁W ave " ▁tid al ▁bore ▁ ▁link ▁to ▁Pr oud man ▁Inst . ▁page ▁ ▁M asc aret , ▁A eg ir , ▁Por or oca , ▁T idal ▁B ore . ▁Qu id ▁? ▁O ù ? ▁Qu and ? ▁Comment ? ▁Pour qu oi ▁? ▁in ▁Journal ▁La ▁Hou ille ▁Bl anche , ▁No . ▁ 3 , ▁pp .   1 0 3 – 1 4 ▁ ▁Tur bul ent ▁Mix ing ▁beneath ▁an ▁Und ular ▁B ore ▁Front ▁in ▁Journal ▁of ▁Coast al ▁Research , ▁Vol . ▁ 2 4 , ▁No . ▁ 4 , ▁pp .   9 9 9 – 1 0 0 7 ▁▁▁▁ ▁Category : Fl uid ▁dynamics ▁Category : W ave ▁mechan ics ▁Category : R iver ▁sur f ing ▁Category : Art icles ▁containing ▁video ▁cli ps <0x0A> </s> ▁Antonio ▁C app ello ▁( 1 4 9 4 - 1 5 6 5 ) ▁was ▁a ▁Ven