Lake Jasper is a small lake in the Awatere Valley, located on Rossmore Station to the west of Taylor Pass Road. The lake is located directly on the Awatere fault, and is the result of a bend in the fault. The lake shores had become overgrown with invasive willows, however it appears the landowners have undertaken a control programme. Native vegetation includes flax (harakeke) and raupō. A variety of waterfowl can be found on the lake. Analysis of sediments from the lake bed have been used to estimate the frequency and magnitude of ruptures of the Awatere fault.