This cache is hidden at one of the weather stations belonging to Central Weather Administration (CWA) in Taiwan. The full list of caches hidden around weather stations can be found HERE.
The word Anbu (鞍部) means saddle point in Chinese. Anbu Weather Station is located at the saddle point between Mt. Datun (大屯山) and West Peak of Mt. Little Guanyin (小觀音山西峰). This station started recording weather parameters in 1937 and was still in work nowadays. One can hike on Mt. Datun from a trailhead right next to the weather station and enjoy the excellent view of Taipei Basin.
The cache is not inside the weather station. Please don't try to enter the weather station without permission.