Avonmore River

{{short description|River in Ireland}}

{{refimprove|date=December 2011}}

{{Use dmy dates|date=December 2020}}

{{Use Irish English|date=December 2020}}

{{Infobox river

| name = River Avonmore

| native_name ={{native name|ga|Abhainn Mór}}

| image = Avonmore5011w.jpg

| image_caption = The Avonmore between Avondale and The Meetings

| source1_location = Lough Dan, County Wicklow

| mouth_location = Meeting of the Waters, County Wicklow

|mouth=River Avoca}}

The Avonmore River ({{irish place name|An Abhainn Mhór|the big river}}),{{cite book|title=The tourist's illustrated hand-book for Ireland|url=https://books.google.com/books?id=zX0HAAAAQAAJ&dq=%22Avonmore%22+Lough+Dan&pg=PA50|year=1859|publisher=W Smith and Sons|page=50}} also known as Abhainn Dé (also spelt Abhainn Dea), flows from Lough Dan in the Wicklow Mountains west of Roundwood. It flows in a generally southerly direction for approximately {{convert|30|km|mi|abbr=on}} before joining the Avonbeg at the Meeting of the Waters (Cumar an dá Uisce) to form the River Avoca, which in turn discharges into the Irish Sea at Arklow. From source to sea the river remains in East Wicklow.

Downstream from Lough Dan the Avonmore reaches the village of Annamoe where it is crossed by the R755 regional road. From there is descends to Laragh and down through a heavily wooded valley to Rathdrum. Near Rathdrum it passes through the grounds of Avondale House, former home of Charles Stewart Parnell. A few kilometers south of Avondale it meets the Avonbeg at the Meeting of the Waters.