The Big/Great Roussel, Big Russel or Grand Ruau is the channel running between Herm on the west, and Brecqhou, and Sark on the east, in the Channel Islands. It has a treacherous current, and the tidal variations in this region are amongst some of the most extreme in the world. It hides a number of sunken rocks.
However, it sees a reasonable amount of marine transport, because Sark has no airstrip, forcing the population to travel to Guernsey by boat.
