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TheMonti della Tolfa (orTolfa Mountains) are avolcanic group in theAnti-Apennines of the northern part of theLazio region ofCentral Italy. They are bounded by theTyrrhenian Sea coast to the west, by theMonti Sabatini to the east, and by theMonti Cimini and theMignone river to the north.Tolfa andAllumiere are the principal towns.
The highest peak is the Monte Maggiore (633 m above sea level). The Monti della Tolfa consists mostly oftrachytes formed during theEocene and the earlyPleistocene.
The mountains are an important source ofalunite, from whichalum is extracted. The mineral was discovered there in 1461, and extensively mined until the mine closed in 1941, after almost 500 years; for much of this time it was the principal source of alum in Europe.
TheTolfetano breed of horse originates in the area, and takes its name from it.
42°08′N11°54′E / 42.133°N 11.900°E /42.133; 11.900
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