reefy

adj

1. containing reefs.

   “I sit up to see myself safe through the narrow passage between Flat Island and Round Island, and fall asleep at last to the monotonous chant of so many "fathoms and no bottom," for we take soundings every five minutes or so in this reefy region.”

   “Then the water clears and his sails swing to the wind, and he is off to the north, along that steel-gray shore of rampart rock, between the white-slab islands and the reefy coast.”