Girona is a city in Spainâ??s northeastern Catalonia region, beside the River Onyar. Itâ??s known for its medieval architecture, walled Old Quarter (Barri Vell) and the Roman remains of the For?§a Vella fortress. Landscaped gardens line the Passeig Arqueol??gic, a walkway following the Old Quarterâ??s medieval walls, which include watchtowers with sweeping views.