In Indonesia, Strategic Environmental Assessment is regulated under the Law No. 32/2009 concerning environmental management and protection. The SEA is mandatory for local government related to the Policy, Plan and Program (PPP), including spatial plan and mid-term development plan. Additionally, sector development especially infrastructure, which usually across administrative boundaries of district and provinces, and are overlapping with sensitive areas such as conservation areas, protected forest, and land as a source of communities, will require an SEA. This slide provide an overview on why and how infrastructure sector in Indonesia will require SEA.