An extensive grid of seismic reflection data collected on Ekstro¨m Ice Shelf, East Antarctica, between 2010–2018,
using an on-ice vibroseis source and snowstreamer, are used to make a detailed bathymetry map of the sea floor
and ice-shelf cavity. The maps shows a deep sea-floor trough, likely a paleao-ice stream, under the western side of
the ice shelf. The trough contains a number of points of higher topography, indicating probable former grounding
line positions. At the shelf front a sill running across the width of the shelf has implications for ocean circulation
and thus ice-ocean interaction and ice shelf melt. This new bathymetry is markedly different from previous
models, which show a generally flat and shallow sea floor in the region. This is presumably the case for many of
the smaller ice-shelves in Dronning Maud Land, which highlights the need for better bathymetry measurements in
these key threshold region
