The Compilation of Environmental, Threats, and Animal Data for Cetacean Population Health Analyses (CETACEAN) Data Portal, developed by the Gulf of America Coastal Ocean Observing System [GCOOS) with funding from the Deepwater Horizon Open Ocean Trustee Implementation Group, supports the effort to understand open ocean and pelagic ecosystems by centralizing data on cetaceans and their environment in the Gulf of America. The CETACEAN Data Portal integrates biological, environmental, and anthropogenic datasets to enable users to explore relationships among cetacean (whales and dolphins) distributions, stressors and threats, and ecosystem drivers to help inform restoration managers and stakeholders. Hosted on a cloud-based GIS Hub, the portal enhances access to standardized datasets and supports visualization and analytical tools that enable users to investigate spatial and temporal trends in marine mammal health and exposure to threats such as vessel traffic, underwater noise, and environmental variability. By facilitating data discovery and synthesis across disciplines, the CETACEAN Data Portal helps illuminate ecological connections and supports restoration and conservation planning The hub further serves as a model for using open-access, GIS-based systems to improve the understanding of open ocean ecosystem linkages, inform adaptive management, and advance restoration of oceanic species and habitats in the Gulf of America.