Deroche is a farming and railway community on the Canadian Pacific Railway and BC Highway 7 located approximately 110 km east of Vancouver, British Columbia, Canada. Deroche is adjacent to the eastern end of Nicomen Island, from which it is separated by the Nicomen Slough (NB a different location 3 km away was known as Deroche Landing). The community is at the foot of Nicomen Mountain and is immediately across the river from Chilliwack Mountain.