The sixth large expansion to Carcassonne released in Europe by Hans im Glück is actually a compilation of three existing small expansions and a new one. Before Z-Man Games picked up the Carcassonne license, this compilation was only available in the US from Rio Grande Games as part of the Big Box 2, or each small expansion was available individually.
This compilation contains:
7 tiles out of Carcassonne: King & Scout (the King & Scout tiles extending Carcassonne: Hunters and Gatherers are not included in this expansion)
Carcassonne: The Count of Carcassonne
Carcassonne: The River II
Carcassonne: The Cult, which was first made available in this compilation.