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It is important to map the large-scale matter distribution in the localUniverse for cosmological studies, such as the tracing of the large-scalepeculiar velocity flow, the characterisation of the environment for differentastronomical objects, and for precision measurements of cosmologicalparameters. We used X-ray luminous clusters to map this matter distribution andfind that about 51% of the groups and clusters are members of superclusterswhich occupy only a few percent of the volume. In this paper we provide adetailed description of these large-scale structures. With a friends-to-friendsalgorithm, we find eight superclusters with a cluster overdensity ratio of atleast two with five or more galaxy group and cluster members in the cosmicvolume out to z = 0.03. The four most prominent ones are the Perseus-Pisces,the Centaurus, the Coma, and the Hercules supercluster, with lengths from about40 to over 100 Mpc and estimated masses of 0.6 - 2.2 10^16 Msun. The largest ofthese structures is the Perseus-Pisces supercluster. The four smallersuperclusters include the Local and the Abell 400 supercluster and twosuperclusters in the constellations Sagittarius and Lacerta. We providedetailed maps, member catalogues, and physical descriptions of the eightsuperclusters. By constructing superclusters with a range of clustersub-samples with different lower X-ray luminosity limits, we show that the mainstructures are always reliably recovered.

The Cosmic Large-Scale Structure in X-rays (CLASSIX) cluster survey IV: Superclusters in the local Universe at z <= 0.03