Explanation:
The country with the biggest irrigation system in the world is Pakistan.
Pakistan's Indus Basin Irrigation System (IBIS) is the largest contiguous irrigation system globally. It includes:
- Three major reservoirs: Tarbela, Mangla, and Chashma.
- 19 barrages and headworks.
- 12 interlink canals.
- An extensive network of canals, distributaries, and field channels irrigating approximately 16 million hectares (39.5 million acres) of agricultural land.