Highest-resolution MeerKAT H I maps of Sextans B. Panel (a): Integrated H I intensity (moment 0). Panel (b): Optical stellar emission (red contours, in arbitrary units) overlaid on the H I moment 0 map. The contours are at 5, 10, 20, 40, 80, and 100σ above the background noise (σ) of the optical image. Panel (c): Intensity-weighted velocity field (moment 1). Panel (d): Velocity dispersion map (moment 2). The maps show a centrally concentrated H I disc with a pronounced internal structure, including multiple cavities embedded in clumpy high-column-density gas, together with small-scale structure extending into the outer regions.