Tolosaldea is one of the eight comarcas in Gipuzkoa, formed by 28 municipalities. Tolosa is the main town. An estimated 47,880 people live in the area in 2018.

Tolosa is a town and municipality in the Basque province of Gipuzkoa, in northern Spain. It is located in the valley of the river Oria, next by Uzturre, a local mountain topped by a white cross.