Tidal waves are the regular rise and fall of ocean water caused by the gravitational pull of the Moon and Sun. They are predictable and occur twice daily.

Tsunamis are giant waves caused by underwater earthquakes, volcanic eruptions, or landslides. They are not predictable and can travel across vast distances.

Here's a breakdown:

Tidal Waves:

* Origin: They originate in the ocean and are a continuous phenomenon caused by the gravitational pull of the Moon and Sun.

* End: They don't have an "end" in the sense of disappearing. They are a constant movement of water, driven by celestial forces.

Tsunamis:

* Origin: Tsunamis originate in specific locations like subduction zones (where tectonic plates meet), volcanoes, or landslides.

* End: Tsunamis lose energy as they travel, but their impact can be felt far from their origin. They can eventually dissipate in open ocean or crash on coastal areas causing significant destruction.

Therefore, "tidal waves" don't truly have an "end" because they are a continuous phenomenon. Tsunamis, however, have a defined starting point and eventually dissipate, though their effects can be felt for a long time.