Ap Corral 1 lies 0.7km SE of Korbulag village (map quad C5d).
The corral is set on a gentle western slope of a north-east running ridge.
This square corral measures approximately 8x14m and is composed of roughly worked, double faced stone walls. It is one of the more carpentered corrals recorded during the survey with a well-defined entrance at the northeast corner marked by tall standing stones on either side of the doorway.
The west wall is 8m in length and 1.7m wide at a bearing of 310°. The north wall is 14m in length and 2.15m wide at a bearing of 36°. The east wall is 9m long and 1.5m wide at a bearing of 326°. The south wall is 11m long and 1.5m wide at a bearing of 94°. The masonry of the north, east and south walls is generally "cyclopean" with large roughly worked stones set atop one another. The west wall is more finely made with two roughly worked faces of boulders bracketing a rubble interior.
No surface materials.