Flash floods in Southeast Asia are increasingly worrying. Climate change factors, rapid urbanization, and poor environmental management contribute to the intensity and frequency of flash floods in this region. With increased rainfall, especially during the rainy season, many countries such as Indonesia, Malaysia and the Philippines are experiencing significant impacts. In Indonesia, regions such as Java and Sulawesi often face flash floods, especially after prolonged heavy rain. Rivers overflowing, landslides, and deforestation exacerbate conditions. In 2023, flash floods in Kalimantan left thousands of people homeless and seriously damaged infrastructure. This situation sparked public anger towards the government which was considered slow in handling it. Meanwhile, Malaysia also recorded an increase in flash flood incidents. Especially in the East Coast region, flooding often occurs due to inadequate drainage systems and excessive development. Unsustainable infrastructure projects add to risks, making communities more vulnerable to these disasters. The Philippines, on the other hand, faces unique challenges; the combination of extreme weather and island geography increases the risk. Flash floods in Manila and other areas caused huge economic losses, with impacts on the agricultural and fishing sectors that are the backbone of the local economy. In recent months, successive storms have left a trail of destruction, disrupting residents’ daily lives. Flash floods not only affect society, but also result in changes to the ecosystem. Submerged urban areas are often polluted, affecting water quality and public health. Endangered flora and fauna are increasingly stressed under these conditions, creating new challenges for conservation efforts. Governments across Southeast Asia are looking for solutions to address this problem. Some countries are starting to introduce better watershed management policies and investment in green infrastructure to absorb rainwater. Public education about climate change and environmental conservation is an important part of mitigation strategies. Technology also plays a role in dealing with flash floods. Early warning systems are now used to provide timely information to residents about the threat of flooding. Communities are empowered to use applications and other digital tools to monitor weather and enter data into disaster management systems. However, all of these steps require cooperation between the government, NGOs and the community. To reduce the impact of flash floods, cross-sector collaboration and a community-based approach are essential. Research and development also need to be encouraged to find innovations in disaster mitigation and management. One strategy is to build a national network to share knowledge and experience among Southeast Asian countries. This will not only increase community resilience to flooding, but also encourage each other to implement best practices in natural resource management. Overall, dealing with increasingly severe flash floods in Southeast Asia is a major challenge that requires a multidimensional approach. From infrastructure improvements to outreach and international collaboration, all parties must come together to create sustainable solutions. Initiatives to protect the environment and be aware of the impacts of climate change are important to protect society in the future.