• Aa River (France)
  Aa River (France)
  The Aa is an 89 km long river in northern France. Its source is near the village Bourthes. It flows through the following départements and cities:* Pas-de-Calais: Saint-Omer.* Nord: Gravelines....
  
  , a river in northern France
• Aa River (Meuse)
  Aa River (Meuse)
  The Aa is a small river in The Netherlands. It rises near Meijel in the southeastern province of Limburg, in the Peel region. It flows northwest through the province of North Brabant towards 's-Hertogenbosch, roughly along the Zuid-Willemsvaart canal. In 's-Hertogenbosch, at the confluence of the...
  
  , a river in North Brabant, Netherlands
• Aa of Weerijs, a river in North Brabant, Netherlands
• Drentsche Aa
  Drentsche Aa
  The Drentsche Aa is a river rising in the Dutch province of Drenthe, flowing through the province of Groningen. It ends in the Schipsloot near Haren, which flows into the Noord-Willemskanaal, however originally it ended into the Selwerderdiep...
  
  , a river in Groningen, Netherlands
• Aabach (Greifensee)
  Aabach (Greifensee)
  The Ustermer Aa or Aabach is a river in the Canton of Zürich, Switzerland. The river, which has a length of 11,2 km, flows from the Pfäffikersee to the Greifensee through the deep Aatal .- References :...
  
  , or Ustermer Aa, a river in Switzerland
• Sarner Aa
  Sarner Aa
  The Sarner Aa is a river in Switzerland. It drains the Lungerersee and is a tributary of Lake Lucerne, which is drained by the Reuss River....
  
  , a tributary of Lake Lucerne in Switzerland
• Aabach (Afte)
  Aabach (Afte)
  The Aabach, formerly called the Große Aa, is a 14 km long river in Germany, a left tributary of the river Afte. It rises in eastern North Rhine-Westphalia near the border with Hesse, between Bad Wünnenberg and Marsberg. Its source is where the regions Briloner Höhen and Sindfeld meet, in...
  
  , formerly called the Große Aa, a river in Germany
• Aa (Möhne)
  Aa (Möhne)
  Aa is a river of North Rhine-Westphalia, Germany. It is 7.4 km long and is a left tributary of the Möhne in Brilon. The river has a watershed of 23.071 square kilometres....
  
  , a river in North Rhine-Westphalia, Germany
• Aa (Nethe)
  Aa (Nethe)
  Aa is a river of North Rhine-Westphalia, Germany....
  
  , a river in North Rhine-Westphalia, Germany
• Aa (Werre)
  Aa (Werre)
  Aa is a river of North Rhine-Westphalia, Germany....
  
  , a river in North Rhine-Westphalia, Germany
• Aa, a river in Antwerp, Belgium which joins the Nete River
  Nete River
  The Nete is a river in northern Belgium, right tributary of the Rupel. It flows through the Belgian province of Antwerp. It is formed in Lier, at the confluence of the rivers Grote Nete and Kleine Nete...
  
  
• Große Aa
  Große Aa
  The Große Aa is a 25 km long, right, eastern tributary of the River Ems in western Lower Saxony .It begins in the collective municipality of Freren, near the quarter of Overwater, at the confluence of the Deeper Aa and Ahe rivers. From there is flows through Lünne westwards to Hesselte, where...
  
  , a river in Lower Saxony, Germany
• Münstersche Aa
  Münstersche Aa
  The Münstersche Aa is a river in the Münster region of Westphalia in Germany. It is a left tributary of the Ems. The Münstersche Aa begins near Havixbeck, flows southeast until Münster, and then north to Greven, where it flows into the Ems. The total length of the Münstersche Aa is about 30 km....
  
  , a river in Germany, one of several Westphalian rivers called Aa

Former names

• Gauja
  Gauja
  The Gauja is one of the longest rivers in Latvia, with a length of and a catchment area of . Its source is in the hills southeast of Cēsis. It first flows east and north and forms the border with Estonia for about . South of Valga and Valka, it turns west towards Valmiera, continuing southwest...
  
  , a river in Latvia, formerly known as Livländische Aa
• Lielupe
  Lielupe
  The Lielupe is a river in central Latvia. Its length is 119 km . The surface area of its basin is 17,600 km²...
  
  , a river in Latvia, formerly known as Kurländische Aa