The Giara di Gesturi, Sardinian: Sa Jara Manna, is a high, steep-sided basaltic plateau which extends for about 42 km2 (16 sq mi) in the districts (comuni) of Gesturi, Tuili and Setzu in the province of Medio Campidano, and Genoni in the province of Oristano, in the southern central part of the island of Sardinia, Italy. The whole of the Giara di Gesturi lies within an area which was included in the Regional Plan of Parks and Nature Reserves approved by Regional Law no. 31 of 1989 , but the Park was not subsequently designated.