|Lake type||natural lake, reservoir|
|Basin countries||United Kingdom|
|Surface area||9.8 ha (24 acres)|
|Surface elevation||368 m|
Llyn Fawr has an area of 9.8 hectares (24 acres) and lies south of Rhigos in the unitary authority of Rhondda Cynon Taff. It lies near the source of the river Rhondda Fawr, at an altitude of 368 metres, and is overlooked by the crags of Craig y Llyn. Originally a smaller lake, it was converted into a reservoir in the early 20th century.
The Llyn Fawr hoard was discovered between 1911 and 1913 during the construction of the reservoir. It contains many objects from the late Bronze Age, but also a number of iron objects, notably an iron sword of the Hallstatt type. Two other iron implements were found, a spear and a socketed sickle. Bronze items included two cauldrons and axeheads. The items appear to have been placed in the lake as votive offerings. The date of these items is uncertain because of the context of the finds, but the sword is thought to date from about 650 BC. It is the earliest iron object discovered in Wales.
- Leslie Alcock (1972) The Irish Sea Zone in the Pre-Roman Iron Age CBE Research Report 9
- Frances Lynch, Stephen Aldhouse-Green & Jeffrey L. Davies (2000) Prehistoric Wales (Sutton Publishing) ISBN 0-7509-2165-X
- Photograph of Llyn Fawr
- Bronze cauldron found at Llyn Fawr
- Reconstruction of an offering at Llyn Fawr
- www.geograph.co.uk : photos of Llyn Fawr and surrounding area
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