some info here:
isprambiente.gov.it/files/pubblicazioni/atti/stato-arte-sinkholes/229-248.pdf
massamarittima-toscana.net/colline_metallifere_4.html

.... The Aronna source is made up of two groups of springs, some forming small lakes,
set on the clay shales and fluvial-lacustrine sediments at the edges of a ridge made up of Cavernous Limestone. The total flow rate is 850 l/sec (DEFERRARI & LOTTI, 1886). ....
.... South of Colle massetano, is the Venelle source that appears with numerous springs both on the surface of the earth's crust and deeper down; the waters are collected in the artificial canal that conveys the courses in the Valpiana area, and after having also welcomed the Aronna (commonly called "Le Ronne") they end up in the Gora delle Ferriere. ,,,,,

Translated by Google •

Stenio Melani

August 26, 2025

South of the Massa Marittima hill lies the Venelle spring; its waters are collected in the artificial canal that channels the streams into the Valpiana area, and after also collecting the Aronna (commonly known as "Le Ronne"), they end up in the Gora delle Ferriere. The water from the Venelle is clear and tasteless.
A little over three kilometers from this spring is the Aronna spring, which has a higher flow rate. Its waters are also collected by an artificial canal and channeled towards Valpiana. Together with the Venelle, they form the Gora delle Ferriere.

Translated by Google •

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Location: Massa Marittima, Grosseto, Tuscany, Italy

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