The city of Jonzac is far from the prefecture of Charente-Maritime, La Rochelle, that is at 105 km (65 mi) to the northwest, but it is at only 55 km (34 mi) from Angoulême, prefecture of the neighbour department of Charente, and at 90 km (56 mi) from Bordeaux, prefecture of the department of Gironde and main city of the Nouvelle-Aquitaine region.

Jonzac has an area of 13.09 km² (5.05 sq mi) and its average altitude is 57 m (187 ft); at the city hall, the altitude is 40 m (130 ft).

The communes that are around Jonzac are Saint-Martial-de-Vitaterne, Réaux,  Champagnac, Ozillac, Saint-Simon-de-Bordes and Saint-Simon-de-Bordes.

The Seugne river, a left tributary of the Charente river, flows through the city from southeast to northwest.
The city of Jonzac is far from the prefecture of Charente-Maritime, La Rochelle, that is at 105 km (65 mi) to the northwest, but it is at only 55 km (34 mi) from Angoulême, prefecture of the neighbour department of Charente, and at 90 km (56 mi) from Bordeaux, prefecture of the department of Gironde and main city of the Nouvelle-Aquitaine region.
Jonzac has an area of 13.09 km² (5.05 sq mi) and its average altitude is 57 m (187 ft); at the city hall, the altitude is 40 m (130 ft).
The communes that are around Jonzac are Saint-Martial-de-Vitaterne, Réaux,  Champagnac, Ozillac, Saint-Simon-de-Bordes and Saint-Simon-de-Bordes.
The Seugne river, a left tributary of the Charente river, flows through the city from southeast to northwest.
Jonzac