The Bay of Fundy is famous (or notorious) for having the
world's highest tides accompanied by bores (the true tidal waves)
which can have vertical leading edges over 10 feet high.
visiting this arch, make sure that you familiarize yourself with the
schedule for high and low tide. The tide comes in extremely
quickly and if you are careless, you can easily wind up stranded
or worse. Robert's recommendation is to visit the arch 3 hours
before low tide. By this time, the waters should have receded
enough to make the arch accessible and you will have more than
enough time to get to the arch and take pictures before the tide
starts to come back in.
In the town of Parrsboro, Nova Scotia, get on the "Two
Islands Road". After a few miles, the pavement ends. Proceed
on the very passable dirt road until you reach a small parking area
on the right, which is marked by an interpretive sign explaining
that this is the area in which some of the worlds oldest dinosaur
fossils have been found. Proceed down the short trail to the
beach and continue to the right. Proceed around the small point
of land jutting into the Bay of Fundy; and the arch will be right in
front of you.