Karachi is the capital of the province of Sindh, and the largest city in Pakistan. Located on the coast of the Arabian Sea, north-west of the Indus River Delta, the mega city is the largest city, original capital and cultural, economical, philanthropic, educational, and political hub, as well as the largest port, of the country.
The metropolitan area along with its suburbs comprises the world's second most populated city, spread over 3,530 square kilometers. The city credits its growth to the mixed populations of economic and political migrants and refugees from different national, provincial, linguistic and religious origins who have largely come to settle here permanently.
It is locally termed as the City of Lights for its liveliness and the City of The Quaid, for not only being both the birth and death place of Quaid-e-Azam Muhammad Ali Jinnah the founder of Pakistan but also his home after 1947. Residents and those born in the city are called "Karachiites".
The City-District of Karachi is divided into eighteen towns governed by elected municipal administrations responsible for infrastructure and spatial planning, development facilitation, and municipal services (water, sanitation, solid waste, repairing roads, parks, street lights, and traffic engineering), with some functions being retained by the CDGK.
The towns are sub-divided into 178 localities governed by elected union councils (UC's), which are the core element of the local government system. Each UC is body of thirteen directly elected members including a Nazim (mayor) a Naib Nazim (deputy mayor). The UC Nazim heads the union administration and is responsible for facilitating the CDGK to plan and execute municipal services, as well as for informing higher authorities about public concerns and complaint.