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We have produced a continent-scale, high-resolution radar mosaic of Southeast Asia using L-band Synthetic Aperture Radar (SAR) data collected by Japanese Earth Resources Satellite-1 (JERS-1). This 100 m resolution, 16-bit mosaic dataset of the backscattering coefficients has a calibration accuracy of 1.1 dB, geometric accuracy of 406 m, and an image quality similar to those of Amazon and central Africa previously produced by NASA Jet Propulsion Laboratory (JPL) and the Joint Research Center (JRC) of the European Commission (EC). This dataset may be beneficial in Earth observation research, especially for forest monitoring, because the L-band signal is sensitive to forest characteristics. This paper introduces a new mosaicking method that was developed to assemble the SAR path images into a large-scale mosaic, a way to recalibrate the radiometric imbalance across paths, and the validation. [ABSTRACT FROM AUTHOR]