Though there are other small landmasses amongst the larger Islands of the archipelago, few of them are large enough to be considered "islands." Few of these landmasses have names.
Most notable is the small, desolate collection of boulders known as Vesper's Rock. As the Rock is near Gorgossium and small enough not to be obvious, it is used by Christopher Carrion to perform various magical acts away from the sight of Mater Motley.
Another "rock of distinction" is Alice Point, a now defunct viewing station from which people were formerly able to catch glimpses of the Time Out of Time.