The Avonmore River also known as Abhainn Dé (also spelt Abhainn Dea) flows from Lough Dan

Lough Dan

Lough Dan is a boomerang-shaped ribbon lake near Roundwood, County Wicklow, Ireland. It is a popular area for hikers and kayakers and lies very close to the Wicklow Way....

 in the Wicklow Mountains

Wicklow Mountains

The Wicklow Mountains form the largest continuous upland area in Ireland. They occupy the whole centre of County Wicklow and stretch outside its borders into Counties Carlow, Wexford and Dublin. Where the mountains extend into County Dublin, they are known locally as the Dublin Mountains...

 west of Roundwood

Roundwood

Roundwood, historically known as Tochar , is a village in County Wicklow, Ireland. It was listed as having a population of 589 in the census of 2006....

. It flows in a generally southerly direction for approximately 30 km (18.6 mi) before joining the Avonbeg

River Avonbeg

The Avonbeg River rises on the northern flank of Carmenbologue Mountain in the Wicklow Mountains and flows southeast into the valley of Glenmalure. It continues southeast through the villages of Greenan and Ballinaclash before joining the Avonmore at the Meeting of the Waters to form the River...

 at the Meeting of the Waters (Cumar an dá Uisce) to form the River Avoca

River Avoca

The Avoca is a river in County Wicklow, Ireland. It is contained completely within the county.The Avoca starts life as two rivers, the Avonmore and the Avonbeg...

, which in turn discharges into the Irish Sea

Irish Sea

The Irish Sea separates the islands of Ireland and Great Britain. It is connected to the Celtic Sea in the south by St George's Channel, and to the Atlantic Ocean in the north by the North Channel. Anglesey is the largest island within the Irish Sea, followed by the Isle of Man...

 at Arklow

Arklow

Arklow , also known as Inbhear Dé from the Avonmore river's older name Abhainn Dé, is a historic town located in County Wicklow on the east coast of Ireland. Founded by the Vikings in the ninth century, Arklow was the site of one of the bloodiest battles of the 1798 rebellion...

. From source to sea the river remains in East Wicklow.

Downstream from Lough Dan the Avonmore reaches the village of Annamoe

Annamoe

Annamoe is small picturesque village in County Wicklow, Ireland about from Dublin located on the Avonmore river. It is on the R755 between Roundwood and Laragh on the road to Glendalough....

 where it is crossed by the R755

R755 road

The R755 road is a regional road in Ireland. It runs for its entire length in County Wicklow. From the village of Kilmacanogue on the N11 national primary road it goes north/south for to the town of Rathdrum.-Route:...

 regional road

Regional road

A regional road in Ireland is a class of road not forming a major route , but nevertheless forming a link in the national route network. There are over 11,600 kilometres of regional roads. Regional roads are numbered with three digit route numbers, prefixed by "R" A regional road in Ireland is a...

. From there is descends to Laragh

Laragh, County Wicklow

Laragh is a small picturesque village in County Wicklow, Ireland. It lies at the junction of three roads through the Wicklow Mountains and is primarily known for its proximity to the monastic settlement of Glendalough...

 and down through a heavily wooded valley to Rathdrum

Rathdrum, County Wicklow

Rathdrum is a village in County Wicklow, Ireland. It is situated high on the western side of the Avonmore river valley, which flows through the Vale of Clara.-People:Born in Rathdrum:...

. Near Rathdrum it passes through the grounds of Avondale House

Avondale House

Avondale House, in Avondale, County Wicklow, Ireland, is the birthplace and home of Charles Stewart Parnell one of the greatest political leaders in Irish history.-Place:...

, former home of Charles Stewart Parnell

Charles Stewart Parnell

Charles Stewart Parnell was an Irish landowner, nationalist political leader, land reform agitator, and the founder and leader of the Irish Parliamentary Party...

. A few kilometers south of Avondale it meets the Avonbeg at the Meeting of the Waters.