▁California ▁in ▁Mexico ▁at ▁the ▁mouth ▁of ▁the ▁Colorado ▁River . ▁It ▁formed ▁in ▁the ▁est u ary ▁about ▁Mont ague ▁Island ▁and ▁propag ated ▁up stream . ▁Once ▁very ▁strong , ▁later ▁divers ions ▁of ▁the ▁river ▁for ▁ir rig ation ▁have ▁weak ened ▁the ▁flow ▁of ▁the ▁river ▁to ▁the ▁point ▁the ▁tid al ▁bore ▁has ▁nearly ▁disappeared . ▁ ▁South ▁America ▁ ▁Amazon ▁River ▁in ▁Brazil ▁and ▁Or in oco ▁River ▁in ▁Venezuela , ▁up ▁to ▁ ▁high , ▁running ▁at ▁up ▁to ▁. ▁It ▁is ▁known ▁locally ▁as ▁the ▁por or oca . ▁ ▁M ear im ▁River ▁in ▁Brazil ▁ ▁Arag u ari ▁River ▁in ▁Brazil . ▁Very ▁strong ▁in ▁the ▁past , ▁it ' s ▁considered ▁lost ▁since ▁ 2 0 1 5 , ▁due ▁to ▁buff alo es ▁far ming , ▁ir rig ation , ▁and ▁dam ▁construction ▁along ▁the ▁river , ▁leading ▁to ▁substantial ▁loss ▁of ▁water ▁flow . ▁ ▁L akes ▁with ▁tid al ▁b ores ▁L akes ▁with ▁an ▁ocean ▁in let ▁can ▁also ▁exhib it ▁tid al ▁b ores . ▁ ▁North ▁America ▁ ▁N it in at ▁Lake ▁on ▁V ancouver ▁Island ▁has ▁a ▁sometimes ▁dangerous ▁tid al ▁bore ▁at ▁N it in at ▁N arrow s ▁where ▁the ▁lake ▁meets ▁the ▁Pacific ▁Ocean . ▁The ▁lake ▁is ▁popular ▁with ▁wind sur fers ▁due ▁to ▁its ▁consistent ▁wind s . ▁ ▁See ▁also ▁▁ ▁T idal ▁bore ▁research ▁( 2 0 1 7 ) ▁The ▁University ▁of ▁Queensland . ▁▁ 1