The Nahanarvali were a Germanic tribe mentioned by Tacitus in his ethnographic book Germania. According to Tacitus, they were one of the five most powerful tribes of the Lugii, living between the Oder and the Vistula. The tribe of Naharvali is speculated by modern scholars to be the same as the Silingi. Tacitus mentions the Naharvali as the keepers of sanctuary of the Lugii (the grove to twin gods Alcis). Tacitus does not mention the Silingi; however, he places the Naharvali in about the same geographical area in which Ptolemaeus placed the Silingi.
^J.H.W.G. Liebeschuetz, "Gens Into Regnum: The Vandals". IN: Hans-Werner Goetz, Jörg Jarnut, Walter Pohl (ed.), "Regna and Gentes: The Relationship Between Late Antique and Early Medieval Peoples and Kingdoms in the Transformation of the Roman World", Brill, 2003, ISBN 1386 4165, p.62.