Among indirect ascents, a popular alternative is to climb Sour Milk Gill from Seathwaite in Borrowdale, first ascending Green Gable before traversing Windy Gap.
sef (sedges) and thveit (clearing) and may be taken to mean "Sedges clearing".
Auntie Mabel and Pippin visit Seathwaite Fell in the second episode of the third series of Come Outside, as they learnt about how graphite was discovered and how pencils are made.