Savannas are distributed globally across various regions. They perform a significant socioeconomic role in regulating net primary productivity and the terrestrial carbon cycle. Owing to the high spatial heterogeneity induced by the mixed distribution of trees and grasses, current global land-cover classification maps often classify savannas as forests or grasslands. Temperate savannas in China cover a vast area, yet their spatial patterns and extent remain poorly understood. This study developed a novel remote sensing temperate savannas mapping method by integrating very high-resolution (VHR) unmanned aerial vehicle (UAV) and GF-6 satellite imagery based on the vegetation structure characteristics of temperate savannas using the FAO definition of savannas. Training and validation datasets were collected from VHR UAV imagery covering the main temperate savannah types with a ground area of 1818 ha. The fractional woody vegetation cover (FWVC) and fractional herbaceous vegetation cover (FHVC) in temperate savannas were estimated by integrating Classification and Regression Tree and Random Forest algorithms. The current distribution of temperate savannas in the Horqin and Otindag Sandy Lands of Eastern China was mapped to a unit area of 0.5 ha. The root-mean-square error (RMSE) values for the FWVC and FHVC models were 10.69% and 11.67%, and the R2 values were 0.66 and 0.63, respectively. The assessment indicated that the new temperate savanna map had high identification accuracy, with a Kappa coefficient of 0.70, overall accuracy of 0.88, and average accuracy of 0.85. Temperate savannas in the sandy lands of eastern China were primarily distributed in the northern Horqin Sandy Land, the central and eastern regions of the Otindag Sandy Land, and the transition zone from the southern slopes of the Greater Khingan Mountains to the plains, covering a total area of 3.27x106 ha. The main savannah types were elm, oak/maple, and shrub savannas. Elm savannas were widely distributed in the Otindag Sandy Land and the eastern and northern Horqin Sandy Land, arranged in stripes and distributed alternately with mobile dunes. Oak/maple savannas were mainly found in northern Horqin Sandy Land and grew on low hills. The largest temperate savannas were shrub savannas, which were primarily distributed in the western Otindag Sandy Land and the central and western Horqin Sandy Land. This study developed a detailed map of temperate savannas in Horqin Sandy Land and Otindag Sandy Land in eastern China, providing their precise area and geographical distribution. This map can support the conservation and utilization of temperate savannas, scientific research, and decisionmaking related to combating desertification and ecosystem restoration in the sandy lands of eastern China. This method provides a new vision for precisely mapping savannas on a global scale and analyzing savanna dynamics.