SAR images of the European SAR 580 campaign taken over a mountainous region from three parallel flight lines are available for stereo measurements. The positions of the three flight lines with respect to a set of ground control points have been calculated by the parallaxes on each image. Using the three available stereo bases, the horizontal and vertical components of the distances between a number of identifiable ground points, along a line approximately perpendicular to the flight direction, have been calculated. The limitations of the accuracy of this procedure are mainly due to the ill-determined stereo base and the confusing appearance of ground features on the different stereo mates. In the best cases, the accuracy of the distance determination is about three times the range resolution of the radar, i.e. ∼ 7·5  m.