The Sterza, Era, and the Ragone rivers form natural borders, placing Lajatico in a very central position to reach Tuscan cities and seaside resorts.

Lajatico has the following hamlets (frazioni) associated with it: Orciatico, an ancient small medieval village; San Giovanni di Val d'Era; and La Sterza.

[3] Lajatico borders the following municipalities: Chianni, Montecatini Val di Cecina, Peccioli, Riparbella, Terricciola, Volterra.

In 1139, Ranieri Pannocchieschi gave to the Bishop of Volterra, Adimaro Adimari, his property stretching to Lajatico and neighboring areas.

At the end of the hostilities, Lajatico came back to the Bishop of Volterra, who brought it, together with Orciatico, Pietracassia and other castles, under the jurisdiction of the city of Florence, which held it until the peace of Fucecchio, in 1293.