Siddharthanagar, also known as Lumbini, is a significant city in southwestern Nepal. It is closely associated with Lumbini, the birthplace of Siddhartha Gautama, who later became the Buddha. The area is a major pilgrimage site for Buddhists and features the Lumbini Garden, sacred pools, and various monasteries. Siddharthanagar serves as a key cultural and historical hub in the region.