Dogana is a curazia of San Marino. It belongs to the municipality of Serravalle. The town is the most populated settlement in San Marino…Dogana is a curazia of San Marino. It belongs to the municipality of Serravalle. The town is the most populated settlement in San Marino, with a population of around 7,000. The town is situated at the northernmost point of San Marino after Falciano, close to the border with Italy.