diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5a23783..d9559b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,6 +15,7 @@ target_sources(CcpTrinityAudioAPI INTERFACE
         include/IStretchAudio.h
         include/ITr2AudEmitter.h
         include/ITr2AudGeometry.h
+        include/ITr2BoxVolume.h
         include/ITr2Audio.h
 )
 
diff --git a/include/ITr2BoxVolume.h b/include/ITr2BoxVolume.h
new file mode 100644
index 0000000..7f4eef9
--- /dev/null
+++ b/include/ITr2BoxVolume.h
@@ -0,0 +1,36 @@
+// Copyright © 2026 CCP ehf.
+//
+//    Description:
+//      An interface for placing a box volume in the world.
+
+#pragma once
+
+#ifndef ITr2BoxVolume_h_
+#define ITr2BoxVolume_h_
+
+BLUE_INTERFACE( ITr2BoxVolume ) :
+	public IRoot
+{
+	/**
+	 * @brief Places the unit box in the world. Creates the volume on the first call and updates it afterwards.
+	 *
+	 * @param unitBoxToWorld Maps the unit box [-0.5, 0.5]^3 to world space. Right-handed, metres,
+	 *                       relative to the current floating origin. Scale encodes the box size.
+	 */
+	virtual void SetTransform( const Matrix& unitBoxToWorld ) = 0;
+
+	/**
+	 * @brief Enables or disables the volume without forgetting its placement.
+	 *
+	 * A volume starts enabled. Call this before the first SetTransform when the owner is disabled,
+	 * so the volume is never briefly active.
+	 */
+	virtual void SetEnabled( bool enabled ) = 0;
+
+	/**
+	 * @brief Removes the volume. The object can be placed again with SetTransform.
+	 */
+	virtual void Remove() = 0;
+};
+
+#endif