Punjab is one of the four provinces of Pakistan. Located in central-eastern region of the country, Punjab is the second-largest province of Pakistan by land area and the largest province by population. It shares land borders with the Pakistani provinces of Khyber Pakhtunkhwa to the north-west, Balochistan to the south-west and Sindh to the south, as well as Islamabad Capital Territory to the north-west and Autonomous Territory of AJK to the north. It shares an International border with the Indian states of Rajasthan and Punjab to the east and Indian-administered Kashmir to the north-east. Punjab is the most fertile province of the country as River Indus and its four major tributaries Ravi, Jhelum, Chenab and Sutlej flow through it.