Exodus 14:22

And the children of Israel went into the midst of the sea upon the dry ground; and the waters were a wall unto them on their right hand and on their left. It is distinctly stated that the water stood on either side, not only on the south; neither did the waters merely recede in an unusually low ebb, for they stood like walls. Thus the angel of the Lord encamps round about them that fear Him and delivers them.