World Tsunamis: History and Impact Tsunamis are large sea waves produced by underwater geological shifts, usually due to earthquakes. This incident has occurred many times in history, with painful consequences for many countries. Since ancient times, coastal communities have been seen to feel the effects of this chain of disasters. One of the most famous tsunamis occurred on December 26, 2004, triggered by a magnitude 9.1 earthquake off the coast of Sumatra, Indonesia. This tsunami devastated many countries along the Indian Ocean, including Thailand, Sri Lanka, and India, causing more than 230,000 deaths and millions of people homeless. Economic losses are estimated at 15 billion US dollars, and recovery will take years. Scientific observation of tsunamis began in the early 20th century when seismograph technology developed. The discovery of a tsunami early warning system was a significant step forward. Countries like Japan, which have a long history of dealing with these disasters, have developed sophisticated systems to detect dangerous waves. This system can provide warning minutes before waves reach shore, saving thousands of lives. In Japan, the largest tsunami recorded occurred on March 11, 2011, when a magnitude 9.0 earthquake struck off the coast of Tohoku. The tsunami that followed killed more than 18,000 people and caused extensive damage to Fukushima, including a nuclear meltdown. This tsunami shows how important understanding geology and preparation is in disaster mitigation. The impact of the tsunami was not only physical but also psychological. People who survive often experience prolonged trauma. Research shows that approximately 25% of survivors experience post-traumatic stress disorder (PTSD). Therefore, the provision of mental health services and social support is important in the rehabilitation process. Tsunamis also have an impact on ecosystems. Large waves can damage natural habitats, such as coral reefs and mangrove forests. If not addressed, this damage can have long-term impacts on the sustainability of fish and other marine biota. Habitat restoration efforts are increasingly important to maintain ecosystem balance after disasters. With increasingly advanced technology and knowledge, disaster mitigation approaches continue to be improved. Evacuation training, community outreach, and developing tsunami-resistant infrastructure are the main focus of many countries. In addition, further research in the fields of oceanography and geology is needed to understand the patterns and causes of tsunamis. The public must also be more aware of the importance of early warning. Education about tsunamis—such as signs of earthquakes and safe behavior when facing a tsunami—can save many lives. Social activities in tsunami-prone areas are important to increase preparedness. Governments and international organizations have an important role in establishing safety standards and preparing resources to deal with a possible tsunami. Cooperation between countries in sharing information and technology is important in building an efficient early warning network. A holistic and sustainable approach in dealing with tsunamis is crucial in mitigating the impact of this disaster. As climate change may influence the frequency and intensity of tsunamis, greater attention should be paid to research and development of adaptive mitigation strategies. The global community needs to unite in understanding the impacts and risks of tsunamis to protect future generations.