Watermarq develops decision-useful data to support investment and collective action for water security. Our novel approach - combining remote sensing with in-situ data, contextual information, and peer-reviewed research - generates basin-specific data on water availability, quality, value, and access. Our outputs include accessible and uniquely high-resolution information for the public, private and financial services sectors. (Watermarq was renamed from Oxford Earth Observation (OxEO) in November 2023).