Four entries with the name White Land.
White Land
Blanche Land, Blankenland
In Thomas’s Tristan, this is one of Tristan’s homes, in Brittany,
In Béroul’s version, an area of Cornwall where Tristan and Isolde fled after their exile from Mark’s court.
Source
Tristan | Thomas of England, 1170-1175
Tristan | Béroul, late 12th century
White Land
The location of a tournament at which Yder and Arthur were the principal combatants. Gawain and the Little Knight fought on Yder’s side and won the tournament.
Source
First Continuation of Chrétien’s Perceval | Attributed to Wauchier of Denain, c. 1200
White Land
The land ruled by King Lancelot, Lancelot’s grandfather. It bordered on the Foreign Country (Strange Land).
Source
Vulgate Lancelot | 1215-1230
White Land
The King of the White Land is named as an ally of Arthur in Claris et Laris. A Queen of the White Land appears in a tournament in Durmart le Gallois.
Sources
Durmart le Gallois | Early 13th century
Claris et Laris | 1268