What is "ninglinspo"

The Ninglinspo is a stream in Belgium, tributary of the Amblève upstream from Remouchamps around Quarreux. The valley of Ninglinspo is classed as an outstanding heritage area of Wallonia. It runs between Vert-Buisson and Nonceveux. The Ninglinspo forms rapids around enormous blocks of quartzite, forming a series of pools with evocative names.