a Black areas are Titan’s 5-μm-bright regions as mapped in MacKenzie et al.24. Hotei and Tui Regiones are the 5-μm-bright regions at ≈80°W, 25°S and ≈120°W, 25°S. AO/GBT observations are plotted as in Fig. 2. Hotei and Tui Regiones are the main source of the AO/GBT anomalously specular reflections. Two noteworthy exceptions to the strong correlation of anomalously specular AO/GBT observations to Hotei/Tui are labeled NE1 and NE2 and discussed in the Discussion section. b The 18-km subradar track (red line) of the highest maximum-NRCS (and most specular in Black et al.2) AO/GBT observation, located in Hotei Regio (largest red dot in Hotei Regio in a). c The stereo topography of the same area37. The AO/GBT reflection is from a bright area that is morphologically similar to paleolakes25 (b) and is topographically low (c). d The 18-km subradar track (red line) of the second highest maximum-NRCS (and second most specular in Black et al.2) AO/GBT observation, located in Tui Regio (largest red dot in Tui Regio in a). The AO/GBT reflection is again from a bright area that is morphologically similar to the comparably specular location in Hotei Regio and paleolakes. Stereo topography does not cover this track.