What is "quarff"

Quarff is a small village in the Shetland Islands in Scotland. It is located on the main A970 road, south of Shetland's only town, Lerwick. The village is spread along a classic glacial valley that runs east-west across the island between high hills to north and south, with centres of population at Easter Quarff which is near the main road and the east coast, and Wester Quarff which is 1½ miles west and faces the Atlantic Ocean. A narrow road runs along the valley between the two.