A circular stone-walled reservoir, 11m in diameter, set off-centre in a roughly 30m square area of broken ground. The reservoir was built as part of a scheme begun in the 1820s and provided water for water features in the pleasure grounds in Glynllifon Park (NPRN 86377).
The reservoir is not depicted on early OS County series maps (Caernarvon. XX.7 1889, 1900), but does appear on the 3rd edition of 1918. The area of brroken ground corresponds to a loose tree clump shown on all earlier editions.
RCAHMW AP965040/63
J.Wiles 25.09.03