Diachronic distribution of Celtic peoples: core Hallstatt territory, by the 6th century BC maximal Celtic expansion, by the 3rd century BC the "six Celtic nations" which retained significant numbers of Celtic speakers into the Early Modern period areas where Celtic languages remain widely spoken today
This is a list of Celtic tribes and associated Celtic peoples with their geographical localization.
A map of Gaul in the 1st century BC, showing the relative positions of the Celtic tribes.
Map of Gallia (58 BC) with important Tribes, Towns, Rivers etc.
Gaul is approximately modern Belgium, France,and Switzerland. At various times it also covered parts of Northern Italy and North central Spain. Gaul included both Celtic speaking and non-Celtic speaking tribes.
List of peoples of Gaul (with their capitals/major settlements):
Cisalpine Gaul, meaning literally "Gaul on this side of the Alps", was the Roman name for a region of Italy inhabited by Gauls, roughly corresponding with modern northern Italy.
The Celts in the Iberian peninsula were traditionally thought of as living on the edge of the Celtic world of the La Tène culture that defined classical Iron Age Celts. Celtic or (Indo-European) Pre-Celtic cultures and populations did exist, even if their cultures do set them somewhat apart from the rest of the Celtic world in Antiquity.
In the third century BC, Gauls immigrated from Thrace into the highlands of central Anatolia (modern Turkey). These people, called Galatians, later merged with the local population but retained many of their own traditions.