Glen River is a short river in County Down

County Down

-Cities:*Belfast *Newry -Large towns:*Dundonald*Newtownards*Bangor-Medium towns:...

, Northern Ireland

Northern Ireland

Northern Ireland is one of the four countries of the United Kingdom. Situated in the north-east of the island of Ireland, it shares a border with the Republic of Ireland to the south and west...

. It flows from the foot of Slieve Commedagh

Slieve Commedagh

Slieve Commedagh is a 767 m mountain in County Down, Northern Ireland. It is the second-highest of the Mourne Mountains, after Slieve Donard, and the second-highest mountain in Northern Ireland....

 and Slieve Donard

Slieve Donard

Slieve Donard is a 850 m mountain in County Down, Northern Ireland. It is part of the Mourne Mountains and the highest peak in Northern Ireland and in the wider province of Ulster. It is the 19th highest peak on the island of Ireland...

 in the Mourne Mountains into Dundrum Bay at Newcastle

Newcastle, County Down

Newcastle is a small town in County Down, Northern Ireland. It had a population of 7,444 people recorded in the 2001 Census. The seaside resort lies on the Irish Sea coast at the base of Slieve Donard, one of the Mourne Mountains, and is known for its sandy beach and the Royal County Down Golf Club...

.

It is quite a fast flowing river with many small waterfalls and deep pools. It flows through Donard Forest and Donard Park

Donard Park

Donard Park is a public park located in Newcastle, County Down, Northern Ireland. It is next to the Glen River, which forms the boundary along one side and is at the foot of Slieve Donard, the highest mountain in Northern Ireland, part of the Mourne Mountains. It is owned and run by Down District...

and is crossed by five bridges. Some of the water from this river supplies the houses in the surrounding area of the south end of Newcastle.