Reed-fringed Llangorse Lake, to the east of Brecon, may be Wales' second-largest natural lake (after Llyn Tegid), but it's barely more than a mile long and half a mile wide. The lake is the national park's main water sports location, used for sailing, windsurfing, canoeing and water-skiing. Lakeside Caravan Park rents rowing boats (per hour/day £12/30), Canadian canoes (per hour/day £12/36) and Wayfarer sailing dinghies (per hour £25; you'll need to know how to rig it yourself).
Close to the northern shore is a crannog , a lake dwelling built on an artificial island. Such dwellings or refuges were used from the late Bronze Age until early medieval times. Tree-ring dating shows that the dwelling (of which only the base remains) was built around AD 900, probably by the royal house of Brycheiniog. Among the artefacts found here was a dugout canoe, now on display in Brecon's Brecknock Museum; other finds can be seen at the National Museum Cardiff. There's a reconstruction of a crannog house on the shore.
