The Tuscany Region has a varied and complex morphology; ranges of mountains and hills alternate with foothills and strips of plain. The true Tusco-Emilian Apennines can be distinguished from the mountainous and hilly groups of the Preapennines, separated by an imaginary line linking Montecatini Terme to Chiusi.
The highest chains along the watershed strip, the Pratomagno group (1,592 m.), the Chianti hills and the southern chain, which stretches between Casentino and Val di Chiana to the west and Val Tiberina to the east, are part of the Apennines; the Apuan Alps (1,945 m.) branch off from the ridge on the inner side. The trachyte massif of Mount Amiata (1,738 m.) and the Colline Metallifere belong to the Tuscan Apennines. The intermontane basins are of particular interest, especially for their settlements; the largest and best defined are Lunigiana, near the upper Magra valley, Garfagnana (upper Serchio basin), the basin of Florence, Mugello (upper Sieve valley), Valdarno Superiore, Casentino, Val di Chiana and lastly, the upper section of Val Tiberina. The most extensive plains are Valdarno Inferiore, Versilia (at the foot of the Apuan Alps) and the coastal plains of Maremma).
The rivers in Tuscany are irregular in size, torrential and winding, for they have adapted to the morphology of the region. With the exception of the upper courses of the Reno, Santerno, Lamone, Marecchia and Foglia, which enter the Adriatic, all the other Tuscan rivers flow into the Tyrrhenian Sea. The most important are the Tiber (only a stretch of its upper course in Tuscany), the Arno with its tributaries, the Sieve, Bisenzio, Greve, Pesa, Elsa and Era, the Magra and the Serchio, respectively flowing through Lunigiana and Garfagnana; the Cecina, the Ombrone and the Albegna, which flow through the Preapennine range.
The climate is temperate but there are considerable zonal variations depending on the distance from the sea, altitude and the position of the mountains. Generally speaking, the temperatures decrease from the Maremma coastal areas (to the SW) towards the Apennines (to the NE). Precipitations fall mainly in spring and autumn. The wettest zones are those of the north-western Apennines and Pratomagno, the Catenaia Alp, the Chianti mountains, the Mount Amiata group and the highest parts of the Colline Metallifere, while the driest are the coastal belt, the plains and the intermontane basins.