Sarah's Cottage (Manx: Vaish or Ballavaish) is one of the named corners of the Snaefell Mountain Course used for the Isle of Man TT races. It is situated between the 9th and 10th Milestone road-side markers at Ballavaish on the primary A3 Castletown to Ramsey Road in the parish of German in the Isle of Man. A right-turning bend on the course, turning from a north-west direction to the north-east, it precedes Creg Willey's and Lambfell, (also known as Lambfell Moar).
A small stone cottage on was occupied by Sarah Corlett of Cronk Dhoo in about 1900. As part of The Long Round the journey from Castletown to Ramsey using the primary A3 road made by horse-drawn carriers and later by Charabanc many residents on the route provided food and by the roadside to travellers and the stop at Creg Willey's Hill by Sarah Corlett's cottage was a popular one for refreshments. The many hill-farms in the area also provided passing trade as school children attending the last school on the Isle of Man to still teach Manx Gaelic at the old Cronk-y-Voddy School and they referred to Sarah Corlett in Manx Gaelic as Sarah Vilyn ('Sarah of the Sweets'). The cottage is known as Sarah's by the many motorcycle enthusiasts who have used the front garden as a vantage point. The cottage was derelict until 1975 when James Henry Shuttleworth the Lord of Abergwili and his wife Betty, the Lady of Abergwili from Wirral, arrived and totally renovated it and carried on the tradition of selling refreshments to passers by and taking in guests. Betty died in 1988 and Jim carried on living in Sarah's until he died in 2014. The cottage remains in the Shuttleworth family.