Some of the key parameters in paleoclimate modelling of long time-scales are paleobathymetry of the ocean basins and paleotopography of the continents. Sedimentary thicknesses, rates and formation processes are essential ingredients for deriving paleobathymetry. As part of the Circum-Antarctic Stratigraphy and Paleobathymetry (CASP) project, we derive the stratigraphic conditions of the Pacific part of the Southern Ocean along the West Antarctic margin from pre-existing and recently collected multichannel seismic data. We link the network of seismic lines from the Antarctic Peninsula to the Bellingshausen and Amundsen Sea. Some of the seismic lines are re-interpreted, new horizons are identified and mapped. Additional information from ice-sheet models and DSDP/ODP boreholes are used to match the stratigraphy across the regional datasets. The resulting stratigraphic compilation contributes to the CASP mapping project, which focuses on creating a continuous series of seamless circum-Antarctic paleoceanographic and paleosedimentary seafloor maps that span from the Cretaceous to present.