Which river is the chief river of Myanmar, known for its rice-growing delta?

The Irrawaddy River is the chief river of Myanmar and plays a vital role in the country’s agriculture, particularly in rice production. The river runs through the heart of Myanmar, flowing from north to south and eventually emptying into the Andaman Sea. Its delta region is one of the most fertile areas in the country, making it ideal for rice cultivation, which is a staple food and a key agricultural commodity for Myanmar. The river’s substantial flow and the sediment it carries contribute to the fertility of the land in its delta, supporting agricultural activities and sustaining the economy.

In contrast, the other rivers listed do not have this specific association with Myanmar or its agriculture. The Mekong and the Yangtze are significant rivers in Southeast Asia and China, respectively, with their own distinct ecosystems and cultural histories, while the Ganges, primarily known in India, is not linked to Myanmar's agriculture or geography. Thus, the Irrawaddy stands out as the correct answer due to its importance to Myanmar's rice-growing delta.