There are three Overland areas in the game. One connects the Underworld, the Lake of the Dead, the Sanctuary of the Clans, and the Silenced Cathedral; another connects the Sanctuary of the Clans and the Tomb of the Sarafan; and the other connects the Lake of the Dead, the Ruined City of the Dumahim, and the Oracle's Cave.
Underworld/Lake of the Dead/Sanctuary of the Clans/Silenced Cathedral
Sanctuary of the Clans/Tomb of the Sarafan
Lake of the Dead/the Ruined City of the Dumahim/Oracle's Cave