The Buddha spent a significant part of his life preaching and travelling in the Gangetic plains, primarily within the territories of Kosala and Magadha. Important sites related to his life, such as Sravasti (capital of Kosala) and Rajagriha (capital of Magadha) and Bodh Gaya, Kushinagar, and Sarnath (all within or bordering these kingdoms), highlight their central role in his journey and teachings.