An English lake to which the boar Twrch Trwyth fled while pursued by Arthur’s warriors. At the lake, Twrch Trwyth and his piglets split up. From here, the boar went on to the Havren River.
Notes
Llwch is the ancient Welsh for an inlet of water, a lake. It corresponds to the Irish lough, Scotch loch, and the English lake.
Source
Culhwch and Olwen | Late 11th century