1. Lake Geneva (Switzerland/France) 2. Lake Constance (Austria/Germany/Switzerland) 3. Lake Balaton (Hungary) 4. Lake Como (Italy) 5. Lake Maggiore (Italy/Switzerland) 6. Lake Garda (Italy) 7. Lough Neagh (Northern Ireland) 8. Loch Lomond (Scotland) 9. Lake Windermere (England) 10. Lake Vänern (Sweden)