Rogue waves are now accepted as a common phenomenon. Professor Akhmediev of the Australian National University has stated that 10 rogue waves exist in the world's oceans at any moment. Some researchers have speculated that roughly three of every 10,000 waves on the oceans achieve rogue status, yet in certain spots ‍ — such as coastal inlets and river mouths ‍ — these extreme waves can make up three of every 1,000 waves, because wave energy can be focused.