From Wikipedia, the free encyclopedia.
Birr is a town in the midland county of Offaly in the Republic of Ireland. It is situated on the Camcor River and has a castle which is open to tourists all the year round. Birr Castle is the home of the seventh Earl of Rosse.
A main feature on the grounds of the castle is the great telescope of the third Earl of Rosse, an astronomical telescope with a 72-inch reflector which was, until 1917, the largest telescope in the world.
Flowing past Birr, the Camcor River flows into the Little Brosna which, in turn, flows into the Shannon.
