From publisher blurb:
A riddled plain. Intricate song carries over the lips of its sinkholes from settlements strung within, above the river clamouring in the depths. Slinkers shrink back. Discord grows.
Condensed to one page for slipping in among other materials, this sandbox-oriented content is intended as an easily absorbed framework for improvisation to be adapted by the user as preferred for a wider setting and specific system.
It presents core ideas and key numbers to fall back on, with general approaches that can be applied in other situations.
The content covers map generation on the fly for an abstracted plain as well as suggestions for aspects of the locality, including dwellers, eyries, a mineral-rich river, warrens and song distortion.
The river could be detailed using Elaboration: Atmosphere & Liquid, and the network including the warrens simplified or extended using one or more of the maps in the Location, Landscape & World bundle, not least The Livid Run.