Allas Pool is a marine spa and lido in Katajanokka, Helsinki, Finland. It was opened on 1 September 2016 on the site of the former Kanavaterminaali building. The spa has three pools built on top of the sea: a children's pool, a warm pool and a seawater pool, as well as a sauna and a café. The main building of Allas Sea Pool was completed in spring 2017. The building has a roof terrace spanning its entire roof. With 1,500 places, Allas Pool is the largest terrace in Helsinki.