1. Largest Irrigation System

The world's largest irrigation network is present in Pakistan. It serves 14.4 million hectares of cultivated land. The irrigation system is fed by water from the Indus River.

2. Largest Deep Sea Port, Gawadar

Gwadar port is the largest deep sea port in the world, located on the southwestern Arabian Sea along the coast line of Balochistan, Pakistan. This port is considered a lifeline in the region’s economy. Pakistan has agreed on a collaboration with China to turn Gwadar into a full scale commercial port.

3. Khewra Salt Mines, World 2nd largest

The Khewra Salt Mine (or Mayo Salt Mine) is located in Khewra, north of Pind Dadan Khan, an administrative subdivision of Jhelum District, Punjab, Pakistan. It is Pakistan's largest and oldest salt mine and the world's second largest. It is a major tourist attraction, drawing up to 250,000 visitors a year. Its history dates back to its discovery by Alexander's troops in 320 BC, but it started trading in the Mughal era. The main tunnel at ground level was developed by Dr. H. Warth, a mining engineer, in 1872, during British rule. After partition the Pakistan Mineral Development Corporation took over the mine, which still remains the largest source of salt in the country, producing more than 350,000 tons per annum of about 99% pure halite. Estimates of the reserves of salt in the mine vary from 82 million tons to 600 million tons.

4. Tarbela Dam

It's the largest earth-filled dam in the world and fifth-largest by structural volume. It is named after the town Tarbela, in Khyber Pakhtunkhwa, about 50 kilometres (31 mi) northwest of Islamabad.

The dam is 485 feet (148 m) high above the riverbed. The dam forms the Tarbela Reservoir, with a surface area of approximately 250 square kilometres (97 sq mi). The dam was completed in 1976 and was designed to store water from the Indus River for irrigation, flood control, and the generation of hydroelectric power.

The primary use of the dam is for electricity generation, the installed capacity of the 3,478 MW Tarbela hydroelectric power stations will increase to 6,298 MW after completion of the ongoing fourth extension and the planned fifth extension financed by Asian Infrastructure Investment Bank and the World Bank.

5. Mohenjo-daro

Mohenjo-daro is an archaeological site in the province of Sindh, Pakistan. Built around 2500 BCE, it was one of the largest settlements of the ancient Indus Valley civilization, and one of the world's earliest major cities, contemporaneous with the civilizations of ancient Egypt, Mesopotamia, Minoan Crete, and Norte Chico. Mohenjo-daro was abandoned in the 19th century BCE as the Indus Valley Civilization declined, and the site was not rediscovered until the 1920s. Significant excavation has since been conducted at the site of the city, which was designated an UNESCO World Heritage Site in 1980. The site is currently threatened by erosion and improper restoration.

Note: Rankings, records or numbers may change with the time.
Source: https://en.wikipedia.org/wiki/