Traveling through BC , south. Cherryville. Lumby, Vernon. Shuswap River in British Columbia​ The basin of the Shuswap River lies northeast of the Okanagan Valley in British Columbia, originating in the central Monashee Mountains. It is the upper part of the drainage better known to British Columbians as belonging to Shuswap Lake and the South Thompson River. Mouth: Mara Lake Country: Canada Province: British Columbia #BC​, #Maralake​, #Vernon​, #Lumby#Shuswapriver​ *Help me create better content for you. Buy me a Coffee.