Marine habitats and oceans form one of Southeast Asia’s most vital landscape categories, encompassing coral reefs, seagrass meadows, mangroves, and deep-sea ecosystems within a region globally recognized for its biodiversity, such as the Coral Triangle. These seascapes provide essential ecosystem services – coastal protection, carbon sequestration, fisheries productivity, and water purification – yet face escalating threats from climate change, overfishing, and pollution.