Sufnersee
reservoir

Sufnersee is a reservoir between Splügen and Sufers on the Hinterrhein river in the Grisons, Switzerland, surrounded by peaks of the Adula Alps. The Sufers dam was built in 1962. The reservoir has a volume of 17.5 million m³ and its surface area is 0.90 km².
Begin with the source’s own compact description: “Sufnersee” is reservoir. The dossier treats that line as a proposition to test through Sufnersee and reservoir, not as a finished interpretation.
Why this record matters
The phrase “reservoir” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Jul 30, 2026. The linked authority identifier is Q671184. Authority coordinates are 46.567, 9.371. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1962.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. 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 “Sufnersee” 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.