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).
Some tsunamis will have a surge in front of them as they approach land. These surges can be very damaging and dangerous. Notice a landslide that falls or slides into the ocean, a large lake, or a river. EVACUATE IMMEDIATELY! if you notice any of these signs or hear a tsunami warning. Tsunami evacuation. Tsunami waves can be 30â100 feet tall or more. If you cannot evacuate to higher ground, go as far inland as possible. If there is a large earthquake, roads and bridges may be damaged.