This preliminary synthesis report includes the mapping, quantification, and qualification of natural capital across wildlife, habitats, grasslands, and waterways, as measured by impact on economic and human well-being. These ecosystems regulate water flow, reduce pollution, support wildlife, pollinate crops, and store carbon that mitigate damage from climate change. USAID and its East African Community partners undertook this first of its kind study to determine the value of natural capital in four priority, transboundary landscapes.