Borumba Dam is the water storage for the Gympie area. It is west of the town of Imbil in the Mary Valley. We sat and ate our picnic lunch there the other day and enjoyed a perfect winter day. The lake is surrounded by hills and there was almost no wind so there were some beautiful reflections. The lake curves around behind the hills so the full length cannot be seen from the picnic area. The lake is also used for boating and fishing.