The section of the channel they sim them across is about 200 yards. But they do it at slack tide, so the water is not deep at all.
That herd would have been lost many years ago if it were not for the volunteers who take care of them, which is a great thing - and the added bonus is the fire company gets helped out.
You don't even have to be a "horse" person to enjoy it - I highly recommend doing it at least once!!!