A fact from Los Campitos Reservoir appeared on Wikipedia's Main Page in the Did you know column on 13 June 2021 (check views). The text of the entry was as follows:
Did you know... that the Los Campitos Reservoir(pictured) in Tenerife has never held water?
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... that the Los Campitos Reservoir in Tenerife has never held water? Source: [1] (Spanish), [2] (PDF is in English, see Fig. 6)
ALT1:... that after constructing a 54-metre-high (177 ft) dam, it was discovered that the basin of the Los Campitos Reservoir was not waterproof? Source: [3] (Spanish), [4] (PDF is in English, see Fig. 6)