Lago di Fondi
lagoon in Province of Latina, Lazio
Lake Fondi (Italian: Lago di Fondi, Latin: Lacus Fundanus, Lacus Amyclanus) is a brackish lake about 90 km (56 mi) to the southeast of Rome in the Province of Latina, Lazio, Italy, in the region called Sud or "South" Pontino, the western end of which is the Piana di Fondi, "Plain of Fondi". The plain is a basin below the arc of the Monti Ausoni and the Monti Lepini. The lake forms naturally at the west end of the basin in a depression constantly filling with spring water exuding from the base of the mountains, which are a heavily cracked and faulted limestone karst absorbent of most rainfall. In addition to the flows from springs, a number of canals have been constructed from regions of the marsh below sea level to drain water from the marsh into the lake. Pumping stations are required to lift the water into the canals. Before the marsh was reclaimed the lake was part of it. Canals at either end of the lake connect it to the Tyrrhenian Sea.
Geology
All the coastal lagoons of Lazio formed in the same way: an offshore Pliocene graben created by extensional forces in NE and SW directions behind a karst of Mesozoic limestone gradually filled by peaty and fluvial deposition in the Pleistocene. A barrier fringe of sand developed offshore enclosing first a lagoon, then a coastal marsh. The remnant chain of lagoons are brackish due to heavy inflow of fresh water from springs at the base of the porous Volscian Mountains and the intrusion of salt water from the marsh, much of which is still below sea level.
The public source identifies “Lago di Fondi” as lagoon in Province of Latina, Lazio. This brief keeps that definition visible, then builds a research path around Lago, Fondi and lagoon.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Lago di Fondi”, the useful work is to connect “lagoon in Province of Latina, Lazio” to the records capable of establishing context and consequence.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Jul 26, 2026. The linked authority identifier is Q3825952. Authority coordinates are 41.324, 13.333. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Lago di Fondi” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.