Honeymill Brook rises at a pond near Browninghill Green, to the south of Baughurst, and at a series of springs to the east of the village near Church Brook Farm. The two sources join near Church Road, Tadley and flow eastwards to Honey Mill Bridge, which carries the A340 Aldermaston Road over the brook. The course of the Port Way Roman road also crosses at this point on the western boundary of Pamber Forest. On the far side of the woodland, it runs parallel to the earthworks and joins Silchester Brook as it turns to the east again. At Park Copse, higher ground prevents further progress to the east, and as turns to the north, it passes a moated site consists of a raised square platform, some square, surrounded by a stream-fed moat and some fishponds. The outflow from the moat joins Silchester Brook at Clapper's Farm. The Reading to Basingstoke railway follows the valley northwards, running alongside the river.