The Ausa is a minor river some long that traverses part of northern San Marino and

Emilia–Romagna egl, Emigliàn (man) egl, Emiglièna (woman) rgn, Rumagnòl (man) rgn, Rumagnòla (woman) it, Emiliano (man) it, Emiliana (woman) or it, Romagnolo (man) it, Romagnola (woman) , population_note = , population_blank1_title ...

in Italy. The source of the river is

Monte Titano Monte Titano ("Mount Titan") is a mountain of the Apennines and the highest peak in San Marino. It stands above sea level and is located immediately to the east of the capital, San Marino. It was inscribed as a UNESCO World Heritage Site in 2008 ...

in central San Marino. The river flows northeast past Serravalle and crosses the border into the Italian province of Rimini close to

Dogana Dogana is a town and a civil parish (''curazia''), whose name means "Customs House"; it is located in the north-eastern corner of San Marino in the Serravalle municipality ("castello"). The town is the most populated settlement in the republic. ...

. The river continues flowing northeast and is channelled through storm drains at Rimini before emptying into the

Marecchia The Marecchia () is a river in eastern Italy. In ancient times it was known as the ''Ariminus'' which was from the Greek ''Aríminos'' (, which is also the ancient name of Rimini). The source of the river is near Monte dei Frati which is east of P ...

. It features the lowest point of San Marino, at above sea level, at the point where it leaves the country.

References

Adriatic Italian coast basins International rivers of Europe Rivers of San Marino Rivers of Italy Rivers of the Province of Rimini {{Italy-river-stub