Two entries with the name Borderland.

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Borderland

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A castle owned by King Brandegorre.

He threw a tournament at Borderland, which was won by Sir Bors.

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Source
Vulgate Lancelot | 1215-1230

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Borderland

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A castle in Benoic (Benwick) ruled by allies of Claudas, the enemy of Lancelot’s family.

Knights from the Borderland tried to liberate a train of prisoners captured by Arthur in the Roman War. The attack was successfully repelled, and Arthur later had Gawaine destroy the castle.

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Source
Vulgate Merlin | 1220-1235

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