Hydro-technical tunnel Harka located in the northern region Sejnane Tunisia, about 100 km west of the capital Tunisa.Hidrotehnički Harka tunnel is located in the water supply system of the northern part of the country (the system of dams and reservoirs associated pipelines and tunnels for water transfer). The purpose of hydropower tunnel Harka is to translate the water from the reservoir Harka Sejnane accumulation, and thus to provide sufficient water for water supply in the region of northern Tunisia.