Explanation: The Ganges River, also known as the Ganga, is one of the most significant rivers in India and plays a crucial role in the country's geography, culture, and economy. Originating from the Gangotri Glacier in the Himalayas, the Ganges flows through the northern plains of India, passing through several major cities and densely populated areas such as Varanasi, Patna, and Kolkata. It eventually empties into the Bay of Bengal, which is a part of the Indian Ocean.
The Ganges River is not only a vital source of water for millions of people but also holds immense cultural and religious significance. It is considered sacred in Hinduism, and millions of pilgrims visit its banks every year to perform rituals and seek spiritual purification. The river supports a diverse ecosystem and is home to various species of fish, birds, and other wildlife.
In terms of geography, the Ganges River basin is one of the most densely populated regions in the world. The river's fertile alluvial soil supports extensive agriculture, making it a lifeline for the region's economy. The river's water is used for irrigation, drinking, and industrial purposes, highlighting its importance as a water resource.
The other options provided in the question are incorrect for the following reasons:
- The Indus River, while significant, flows through Pakistan and empties into the Arabian Sea, not the Indian Ocean.
- The Nile River is located in Africa and does not flow through the Indian subcontinent.
- The Tigris River is located in the Middle East and flows through Iraq, not the Indian subcontinent.
In conclusion, the Ganges River is the correct answer as it is the only river among the options that empties into the Indian Ocean and serves as a water source for the most densely populated areas of the Indian subcontinent.