Geographical maps of Switzerland and selected regions or cities are available in bookstores, tourist shops, petrol stations, post offices, rail stations and airports. The Federal Office of Topography (Swisstopo) offers an online map of Switzerland with some interesting functions. If you're travelling with a smart phone, we recommend apps such as Google Maps. They allow you to download a map of Switzerland and then use it offline as well.
Owner of a Swss Travel Pass can find the validity map here.