The Coralline Sanctum (Japanese: 珊瑚の聖域, Sango no Seiiki) is a location in Xenoblade Chronicles 2. It is located in the south-eastern corner of the Stomach of the Kingdom of Uraya, below the Crown of Sanctuary; it consists of a large pool with raised pads that can be climbed.
The Sealstone of Water, required for Zenobia's Blade Quest, is located in the raised pool here.