Principina Terra is a small town in southern Tuscany, a frazione of the comune of Grosseto.
The frazione is situated south-east of the capital, nearly half way between the residential centre and the coastal localities of Marina di Grosseto and Principina a Mare. The residential area developed during the last century in the area in which the Principina Farm and its relative chapel, the Church of San Carlo Borromeo, elevated to parish in the sixties, were already arising. The area in which the residential area stands was encircled by the banks of the old Prile Lake, almost completely disappeared with the reclamation jobs done in the 18th century by the Lorena family: the waters of the old lake basin were channelled into various drains which coast the residential area crossing one another in multiple points in the nearby plains.