The Royal Mausoleum[1] (Malay: Kubah Makam Diraja)[2] in Batu Satu, Bandar Seri Begawan, is a significant historical and cultural landmark in Brunei.[3] Located along the Brunei River, it lies beyond Kampong Ayer and on the route from Bandar Seri Begawan to the Istana Nurul Iman.Despite this, it is a notable destination for domestic visitors, offering a peaceful setting with ample parking and a refreshment shop for convenience.[4] The graves of several Brunei sultans are designated as ancient monuments and historical sites under the Antiquities and Treasure Trove (Ancient Monuments and Historical Sites) Order, 2007.[6] Meanwhile, the alleged tomb of Sultan Abdul Momin is not gazetted in the order.