Potamon fluviatile and covers parts of many countries with a Mediterranean coastline. It is found in mainland Italy and on the Balkan Peninsula from Dalmatia to the Axios River in Greece. It is also found on a number of islands, including Sicily, Malta and Gozo, the Ionian Islands, Aegean Islands, Sporades and Andros in the Cyclades. Although the species as a whole is widespread, it is declining in numbers, and these insular populations are particularly vulnerable. "Potamon fluviatile" is widely distributed in much of mainland Italy, especially in the provinces of Trento, Lombardy, Veneto, Liguria, Tuscany, Umbria, Lazio, Campania, Apulia, and Calabria,
If This Is a Man not merely its lexical but also its inner faithfulness." Robert S. C. Gordon writes that Levi went on to develop a close relationship with Reidt. The German edition contains a special preface addressed to the German people, which Levi said he wrote out of passionate necessity to remind them what they had done. "If This Is a Man" is often published alongside Levi's second work of witness, "The Truce" (Italian title: "La Tregua"). The book is introduced by a poem. The construction "If .." invites the reader to make a judgment. It alludes to the treatment of people as "Untermenschen"