Punjab (; , ) is a province 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 is bordered by 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 state 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. The province forms the bulk of the transnational Punjab region, now divided among Pakistan and India. The provincial capital is Lahore — a cultural, modern, historical, economic, and cosmopolitan centre of Pakistan. Other major cities include Faisalabad, Rawalpindi, Gujranwala, Sialkot, and Multan- the historic capital of the region. Punjab is also the world's fifth-most populous subnational entity, and the most populous outside of China and India. Punjab is Pakistan's most industrialized province, with the industrial sector comprising 24 percent of the province's gross domestic product. It is known across Pakistan for its relative prosperity, and has the lowest rate of poverty among all Pakistani provinces. However, a clear divide is present between the northern and southern portions of the province; with poverty rates in northern Punjab being among the lowest in Pakistan, while some in southern Punjab are among the most impoverished. Punjab is also one of the most urbanized regions of South Asia, with approximately 40 percent of its population being concentrated in urban areas. It has been strongly influenced by Sufism, with numerous Sufi shrines spread across the province, attracting millions of devotees annually. Guru Nanak, the founder of Sikhism, was born in the town of Nankana Sahib, near Lahore. Punjab is also the site of the Katas Raj Temples, which feature prominently in Hindu mythology. Several of the World Heritage Sites listed by UNESCO are located in Punjab, including the Shalimar Gardens, the Lahore Fort, the archaeological excavations at Taxila, and the Rohtas Fort, among others. Etymology Though the name Punjab is of Persian origin, its two parts ( and ) are cognates of the Sanskrit words, and , of the same meaning. The word pañjāb thus means 'The