San Diego de la Unión
The municipality has an area of 990 . 17 square kilometres ( 3 . 26% of the surface of the state ) and is bordered to the north by San Luis Potosí , to the east by San Luis de la Paz , to the south by Dolores Hidalgo , and to the west by San Felipe . 
<triplet> Dolores Hidalgo <subj> San Felipe <obj> shares border with