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The Ausa is a minor river some 17 kilometres (11 mi) long that traverses part of northern San Marino and Emilia–Romagna in Italy. The source of the river is Monte Titano in central San Marino. The river flows northeast past Serravalle and crosses the border into the Italian province of Rimini close to Dogana. The river continues flowing northeast and is channelled through storm drains at Rimini before emptying into the Marecchia. It features the lowest point of San Marino, at 55 metres (180 ft) above sea level, at the point where it leaves the country.
|Country||San Marino and Italy|
|• location||Monte Titano|
|Progression||Marecchia→ Adriatic Sea|