The important river of the Indian desert is the Luni River. It is the only significant river in the Thar Desert of Rajasthan, India. The Luni River originates in the Pushkar valley of the Aravalli Range and flows westward through the desert before finally draining into the Rann of Kutch in Gujarat.

Key Points:
- Origin: The Luni River originates near the town of Ajmer in the Aravalli Range of Rajasthan. It is formed by the confluence of two streams, the Saraswati and the Sabarmati.
- Flow: After its origin, the Luni River flows in a southwest direction through the arid and barren landscape of the Thar Desert. It is approximately 495 kilometers long and has a drainage basin of about 37,363 square kilometers.
- Tributaries: The Luni River has several tributaries, including the Sarsuti, Jojari, Bandi, and Khari rivers. These tributaries are seasonal and their flow depends on the monsoon rainfall in the region.
- Water Availability: The Luni River is not a perennial river and its flow is highly dependent on the monsoon rains. The river carries water only during the monsoon season and dries up for most of the year. The water availability in the river is limited, and it is primarily used for irrigation and drinking water purposes in the surrounding areas.
- Landforms: The Luni River has formed several landforms along its course, including alluvial plains, sand dunes, and salt pans. The river has also created a few small lakes and reservoirs, which provide water for irrigation and wildlife.
- Importance: Despite its limited flow, the Luni River plays a crucial role in the ecosystem of the Thar Desert. It supports vegetation and wildlife in the region, and the surrounding areas depend on its waters for agriculture and drinking water. The river also has historical and cultural significance, as it has been mentioned in ancient texts and is associated with several myths and legends.

In conclusion, the Luni River is an important river in the Indian desert. It provides water for irrigation and drinking purposes in the arid region, supports the ecosystem of the Thar Desert, and holds historical and cultural significance.