The Jetavanaramaya (Sinhala: ජේතවනාරාමය, jētavanārāmaya) is a stupa, or Buddhist reliquary monument, located in the ruins of Jetavana monastery in the world heritage city of Anuradhapura, Sri Lanka. At 122 metres (400 ft) it was the world's tallest stupa[1] and the third tallest structure in the world[2] when it was built by King Mahasena of Anuradhapura (273–301). He initiated the construction of the stupa following the destruction of the Mahavihara.