The largest island in a lake on an island in a lake on an island is a nameless 1.6-hectare (4-acre) island at 69Â°47â²35â³N 108Â°14â²28â³W / 69.793Â°N 108.241Â°W / 69.793; -108.241, 121 kilometres (75 mi) inland from the south coast of Victoria Island, Canada.
A tsunami can travel across the open ocean at about 500-miles per hour, the speed of a jet airliner. As the wave approaches land and as the ocean shallows, the wave slows down to about 30 miles-per-hour and grows significantly in height (amplitude).
ZetaTalk: How Far Inland. When the tsunami hits Ireland and the UK, approx what speed will it hit the coast line at, and approx how far in land will the tsunami go as Ireland and the UK will be the first and I am assuming worst hit? We have stated that the tsunami that will hit Europe will be from 200-300 feet high at its worst. If the pole shift tidal waves are estimated to strike the coastlines 500-600 feet high, but diminish to 200 feet inland by 100 miles, then assume approximately half this distance and height for the tsunami.