Unterbäch is a municipality in the district of West Raron in the canton of Valais in Switzerland. Unterbäch is first mentioned about 1280 as Un…Unterbäch is a municipality in the district of West Raron in the canton of Valais in Switzerland. Unterbäch is first mentioned about 1280 as Underbechque. On 18 August 1957, Unterbäch was the first community in Switzerland to establish the communal voting and election rights for women.