We study a stratified braneworld model in which a \((d+1)\) -dimensional asymptotically AdS bulk contains N parallel AdS \(_d\) end-of-the-world branes at fixed radii. Using the gravitational replica trick and the quantum extremal surface (QES) prescription, we compute the holographic entanglement entropy of regions on the branes. We find multiple island configurations—one per brane layer—and discrete transitions between them: as the region grows, new islands successively appear on deeper branes when their would-be entropy would exceed the horizon area of that layer, producing a multistep (staircase) Page curve. In the limit of many backreacting layers, the system becomes equivalent to a single thick brane with smoothly varying warp factor A(z) and energy density \(\rho (z)\) . We apply these ideas explicitly to stratified black hole and wormhole geometries, finding that the competition between connected extremal surfaces and island surfaces reproduces the Page curve and restores unitarity.
