The country with the largest population density is Monaco. This small city-state, located on the French Riviera, has a density that significantly surpasses other nations, with over 26,000 people per square kilometer. Monaco's limited land area combined with its affluent population contributes to this high density. The country is well-known for its luxury lifestyle, casinos, and hosting the Monaco Grand Prix. Its unique geographical position and economic focus on tourism drive this dense population.