It is bounded on the north by Paniqui; on the east by the Pura; on the south by the provincial capital Tarlac City; and on the west by Santa Ignacia.

Gerona has a land area of 141.47 square kilometres (54.62 sq mi) of plain and rugged agricultural land representing 4.63% of the province total area.

The Tarlac River, which originates from the eastern slopes of the Zambales Mountains, cuts across the west central areas, dividing the town into two parts.

It is characterized by hilly and rugged agricultural land and is also forested.

Poverty incidence of Gerona Source: Philippine Statistics Authority[13][14][15][16][17][18][19][20]