The Upper Härma Wall, also known as Keldri wall, is Estonia's highest Devonian sandstone outcrop. At 150-metres in length, it extends to a height of 19 metres, compared to the valley's edge which reaches a total height of 43 metres.

Lower Härma, or Kõlgusniidu Wall, is also close by with a total height of 20.5 metres. Lower Härma, a projecting rock face, is arguably one of the most beautiful walls in the Piusa Ancient Valley, well-known for its brightly coloured layers of clay and majestic pyramid shape.

This beautiful area has the added benefit of being host to a fantastic campsite for those wanting to make campfires, located in the meadow at the bend in the river.