The Siak Sri Indrapura Palace, also known as Siak Palace, once the royal residence of the Sultanate of Siak Sri Indrapura in Sumatra, Indonesia, now stands as a museum in Siak Regency, Riau. Covering approximately 32,000 square meters, the complex comprises four distinct palaces: Istana Siak, Istana Lima, Istana Padjang, and Istana Baru, each occupying 1,000 square meters. This architectural ensemble preserves the legacy of Siak's royal history and offers visitors a glimpse into its rich cultural heritage.