Geography

Tarbela Dam is the largest dam in Pakistan by structural volume and reservoir capacity. It is located on the Indus River and is one of the world's largest earth-filled dams.

Tarbela Dam, located in Pakistan, is the largest earth-filled dam in the world by structural volume. It is constructed on the Indus River and is a major source of hydroelectric power and irrigation.

Pakistan has five peaks that are higher than 8,000 meters: K2, Nanga Parbat, Gasherbrum I, Gasherbrum II, and Broad Peak.

Anchar Lake is located in the union territory of Jammu and Kashmir, India. It is a well-known lake near Srinagar.

The Ghulam Muhammad Barrage, also known as the Kotri Barrage, was constructed on the Indus River in Pakistan. It is a key structure for irrigation and flood control.

The Kharan Desert is located in the province of Balochistan, Pakistan. It is a large sandy desert known for its arid climate.

The Mariana Trench is the deepest oceanic trench in the world and is located in the western Pacific Ocean.

Vatican City is the smallest country in the world by land area, covering about 0.49 square kilometers. It is an independent city-state enclaved within Rome, Italy.

The Khunjerab Pass is located in the Karakoram mountain range, which forms the border between Pakistan and China.

Nauru is the world's smallest republic by both area and population. It is an island country in Micronesia, northeast of Australia, with an area of only 21 square kilometers (8.1 square miles) and a population of about 12,300. Monaco is a principality, not a republic, and San Marino, while a republic, is larger than Nauru in area. Tuvalu is also larger than Nauru. Therefore, the correct answer is Nauru.