Gandhara was the name given to the land and its associated civilization that existed in what is now northern Pakistan and Afghanistan from the mid 1st millenium BCE to the beginning of the 2nd millenium CE and consisted of multiple dynasties which ruled over the same area but which were linked by their adoption of Buddhism as a religion for the most part and also of the Indo-Greek artistic tradition as its cultural identity.
THE EXTENT OF GANDHARA
Although Gandhara has been historically known since the Achaemenian Empire and more specifically during the reign of Cyrus the Great (558-28 BCE), it wasn't until the pilgrimage of XuanXang in the 7th century CE, at the tail end of the Gandhara civilization, that we first see a descriptive account of the region down to the extent of the area itself as well as the various places and sites which can be identified today.
It has been speculated that Ganhara was a triangular tract of land about 100 kilometers east to west and 70 km north to south, lying mainly to the west of the Indus River and bounded on the north by the Hindukush Mountains. (1 li = 500 meters or 1640 feet)
The extent of Gandhara proper actually included the Peshawar valley, the hills of Swat, Dir, Buner and Bajaur, all of which lie within the northern bounds of the modern day nation of Pakistan. However the bounds of Greater Gandhara (or regions where the cultural and political hegemony of Gandhara held sway) extended towards the Kabul Valley in Afghanistan and the Potwar plateau in the province of Punjab in Pakistan, in close proximity to the capital city of Islamabad, and bounded off by the location of the grand Mankiyala Stupa on the outskirts of the capital.
ORIGIN OF THE NAME GANDHARA
The name of Gandhara may have several meanings the most prominent theory relates its name to the word Qand/Gand which means "fragrance" and Har which means 'lands' hence the simplest definition being 'Land of Fragrance'. However, when analysed critically, the region known as the core of Gandhara around the Peshawar valley does not historically have any historically verifiable association or importance with regards to fragrance, either through flowers, spices, foods etc.
Another more probable and geographically supported theory is that the word Qand/Gand is evolved from Kun which means 'well' or 'pool of water' and indeed the word Gand appears with many other place names associated with water i.e. Gand-ao or Gand-ab (pool of water) and also Gand-Dheri (water mound). Tashkand (stone walled pool) and Yarkand are also associated names and hence it holds to reason that the land could have been known as 'Land of the Lake(s)' as this signifies the region between the Indus and Kabul rivers which was a fertile region rich in water supplies and especially around Peshawar.