Alpha Regio, a topographic upland approximately 1300 kilometers across, is centered on 25 degrees south latitude, 4 degrees east longitude. In 1963, Alpha Regio was the first feature on Venus to be identified from earth-based radar.
Le point d'observation est situ� � 1 100 kilom�tres (682 milles) au nord-est de Gula Mons et � une �l�vation de 7,5 kilom�tres (4,6 milles).