Revelation 2:8

Smyrna : a city Located on the west coast of Asia Minor, it is now called Izmir.
(38° 27´, 27° 9´)

Revelation 2:12

Pergamum : a wealthy ancient town in the disrict of Mysia in northwest Asia Minor. It is now modern Bergama.
(39° 7´, 27° 9´)

Revelation 2:18

Thyatira : a town in Asia Minor 30 km southeast of Pergamum
(38° 55´, 27° 51´)