**Thar Desert**

The Thar Desert, also known as the Great Indian Desert, is located primarily in the northwestern part of India. It spans across multiple states, including Rajasthan, Gujarat, Haryana, and Punjab. However, out of the options given, the correct answer is **C) Rajasthan**.

**1. Thar Desert in Karnataka:**
Karnataka is a state in southern India and it does not have any part of the Thar Desert. The geography of Karnataka is characterized by the Western Ghats and the Deccan Plateau, which are different from the arid and sandy landscape of the Thar Desert.

**2. Thar Desert in Gujarat:**
Gujarat is a state in western India and it does have a portion of the Thar Desert. The Thar Desert extends into the Kutch region of Gujarat. This area is known for its unique ecosystem and is home to the Kutch Desert Wildlife Sanctuary.

**3. Thar Desert in Rajasthan:**
Rajasthan is a state in northwestern India and it is the largest state in terms of area covered by the Thar Desert. The Thar Desert occupies a significant portion of Rajasthan and is an important geographical feature of the state. The desert landscape attracts tourists from around the world and is known for its sand dunes, camel safaris, and vibrant culture.

**4. Thar Desert in Assam:**
Assam is a state in northeastern India and it does not have any part of the Thar Desert. The geography of Assam is characterized by the Brahmaputra River, the Eastern Himalayas, and dense forests, which are distinct from the arid and sandy landscape of the Thar Desert.

In conclusion, the Thar Desert is primarily located in **Rajasthan** out of the given options. It is a unique and significant geographical feature of the state, attracting tourists and playing a vital role in the ecosystem of the region.

Thar desert located in Rajasthan