We are not to assume that this throne is an actual chair located in a physical place (though sometimes that is possible; see Revelation 2:13), but we are instead to understand that the beast exercises authority anywhere on the earth. That in turn means that the saints cannot find a place where they can escape his efforts to destroy them.
10 The fifth angel poured out his bowl on the throne of the beast, and its kingdom was plunged into darkness. People gnawed their tongues in anguish