Explanation:

- Gautama Buddha was born in Lumbini, which is a grove located in present-day Nepal. It is a significant pilgrimage site for Buddhists around the world.

- Option 1: "Kavus" does not have any known historical or cultural association with the birth of Gautama Buddha. It is not a recognized place related to Buddhist history.

- Option 3: "Mangar Bani" is a protected forest area located in Haryana, India, and is not associated with the Buddha’s birth.

- Option 4: "Mawphlang" is famous for its sacred groves in Meghalaya, India, but it has no connection to Buddha’s birthplace.