The impact of the tsunami was not only physically devastating, but also psychologically shaking the affected communities. Tsunamis can occur as a result of earthquakes, volcanic eruptions, or underwater landslides. The first impact felt was the loss of life. According to a number of reports, a tsunami event could claim thousands of lives in a short time, as happened in Indonesia in 2004. The number of victims included local residents and tourists, resulting in collective trauma. Apart from loss of lives, infrastructure also faced severe damage. Buildings, bridges and roads were left in ruins, making access for help difficult. Survivors often lose their homes and shelter. This situation triggers an urgent need for shelter, food, and health services. In some cases, infrastructure recovery can take years, depending on the scale of the damage. The economic impact of the tsunami was very significant. Many regions depend on the tourism sector, which can experience drastic declines post-disaster. The economic recession occurred due to job losses, not only in the tourism sector, but also in related fields. Foreign investment could be affected, slowing the recovery and rebuilding process. Natural resources were not spared from impacts. Mines, agricultural fields and fisheries resources are threatened with damage. Many ecosystems are experiencing damage due to environmental pollution caused by liquefaction of chemicals and waste from destroyed buildings. Sustainable processing of natural resources is important to restore balance to the ecosystem. Mental health is another aspect to consider after a tsunami. Many survivors experience post-traumatic stress (PTSD), depression, or anxiety. Psychological support, counseling programs, and social activities are needed to help individuals and communities recover. The importance of education and public awareness in dealing with this is very clear. Disaster mitigation efforts, such as early warning systems and evacuation training, can reduce the humanitarian impact caused. Communities must actively participate in preparedness programs to increase the resilience of tsunami-prone areas. Sustainability after the tsunami also focuses on outreach and local resource mobilization. Non-governmental organizations and local governments can work together to implement community-based solutions. With the right support, communities are able to emerge from adversity and begin to build back stronger. The impact of the tsunami is complex and layered, requiring synergy from various social, economic and environmental aspects. All parties, including governments, communities and international institutions, must unite to stop the cycle of disasters and build a safer future.