During colonial rule, agencies were administrative sub-divisions of British India.

Hazara

The Hazara region was split into the following four parts:

1. Kohistan Tribal Area
2. Hazara Tribal Area
3. Princely State of Amb
   Amb (princely state)
   Amb was a princely state of the former British Indian Empire. In 1947, by the Indian Independence Act 1947, the British abandoned their supremacy, and following the Partition of India Amb's Nawab decided to give up his state's independence by acceding to the new country of Pakistan...
   
   
4. Hazara Division
   Hazara Division
   On the dissolution of West Pakistan in 1970, Hazara District and the two tribal agencies were merged to form the new Hazara Division with its capital at Abbottabad...
   
    (Abbottabad and Mansehra)

The northernmost part was the Kohistan Tribal Area, whilst the southernmost part was the Hazara Division. Hazara Tribal Agency was located between the Hazara Division and the Kohistan Tribal Area.

Location

The Hazara Tribal Area, was located in the northwest of British India, it bordered the following areas.

1. Kohistan Tribal Area (to the northwest)
2. Gilgit Agency
   Gilgit Agency
   The Gilgit Agency was a political unit of British India, which administered the northern half of the Princely state of Jammu and Kashmir. The Gilgit Agency was created in 1877 and was overseen by a political agent of the Governor-General of British India. The seat of the agent was Srinagar...
   
    (to the North and North East)
3. Hazara Division (to the south)
4. Amb (to the south east)

The Hazara Division lay along the route to Kashmir

Kashmir

Kashmir is the northwestern region of the Indian subcontinent. Until the mid-19th century, the term Kashmir geographically denoted only the valley between the Great Himalayas and the Pir Panjal mountain range...

 and Punjab

Punjab (British India)

Punjab was a province of British India, it was one of the last areas of the Indian subcontinent to fall under British rule. With the end of British rule in 1947 the province was split between West Punjab, which went to Pakistan, and East Punjab, which went to India...

. The State of Amb formed an enclave within the southern part of the Hazara Tribal area (the North, West and Southern frontiers of the state were along the borders of the agency).