Tsunami is a natural phenomenon that can occur due to earthquakes, volcanic eruptions, or shifting land under the sea. When a tsunami hits, its impact on the environment is very significant and sustainable. One of the most direct impacts is damage to natural habitats, including coastal ecosystems, mangrove forests and coral reefs. Mangrove forests function as a natural buffer that protects beaches from erosion. When a tsunami occurs, large waves can easily destroy these forests, resulting in the loss of homes for various species, as well as reducing water quality. Coral reefs which serve as shelter for many fish also often experience severe damage, reducing local fish populations and impacting the food chain. Furthermore, tsunamis can change physical environmental conditions. Coastlines can shift, land becomes contaminated due to mixing with sea water, and sedimentation carried by waves damages the ecosystem structure. This process results in changes in soil salinity and water quality, which can affect local agriculture. Furthermore, pollution is another bad impact of tsunamis. Hazardous chemicals, industrial waste, and washed-up building materials can pollute waters. This contamination not only harms the ecosystem, but also endangers human health, especially for those who depend on marine resources for food. Land ecosystems are also not immune from the impact of tsunamis. Gardens, agricultural fields and residential areas can be destroyed, causing major economic losses. In addition, the recovery process is slow and takes years for the ecosystem to return to its original condition. Then, the social impact cannot be ignored. The diversion of resources caused by loss of land and ecosystems means that local communities must adapt to new ways of life. This often leads to social conflict due to competition for limited resources. Climate change also plays a role in exacerbating the impact of tsunamis. Sea level rise and weather changes are increasing the frequency and power of these natural disasters. In this context, understanding the forecast and potential environmental impacts of tsunamis is important for future risk mitigation. Therefore, there needs to be further efforts to restore and protect ecosystems after a tsunami. Initiatives such as reforestation of mangrove forests, rehabilitation of coral reefs, and sustainable resource management are urgently needed. Through greater awareness and collective action, the environmental impact of tsunamis can be minimized and ecosystems can be restored for future generations.