Submarine gullies are small-scale, confined channels on the order of tens of metres depth that form one of the most common morphological features of high-latitude continental slopes. Gully morphology varies in width, incision depth, length, sinuosity, branching order, shelf-incision, cross-sectional shape and gully spacing, with six distinct gully signatures recognized on high-latitude continental slopes (Gales et al. 2013 a , b ). Here we analyse the morphology of slope gullies off Halley and Filchner troughs in the southern Weddell Sea (Fig. 1a–f). Fig. 1. Multibeam bathymetry and along-slope profiles of gullies on the southern Weddell Sea continental margin. ( a ) Multibeam data showing V-shaped gullies at the mouth of Halley Trough. Acquisition system Kongsberg EM122. Frequency 12 kHz. Grid-cell size 30 m. ( b ) Sub-bottom profile of U-shaped gullies. VE×20. Location in (e). Acquisition system Kongsberg TOPAS PS 018. Frequency 18 kHz. Secondary beam frequency 1300–5000 Hz. ( c ) Along-slope profile through V-shaped gullies. Location in (a). VE×55. ( d ) Location of the study area (red boxes; map from IBCSO v. 3.0). FT, Filchner Trough; HT, Halley Trough. ( e ) Multibeam data showing U-shaped gullies at the mouth of Filchner Trough. Acquisition system Kongsberg EM120. Frequency 12 kHz. Grid-cell size 30 m. ( f ) Sub-bottom profile of U-shaped gullies. Location in (e). Acquisition …