Terryglass (Irish: Tír Dhá Ghlas[1], meaning 'land of the two streams') is a village in County Tipperary, Ireland.

[6] The monastery became a centre of learning and produced (about 1160) the Book of Leinster, which is now housed in Trinity College Dublin.

The Book is an important collection of history, tales and poems written in Middle Irish and is believed to be the work of Áed Ua Crimthainn, a 12th-century abbot of Terryglass.

Believers visit the well on Saturdays during the month of May between sunrise and sunset in search of cures for eye problems.

The ritual begins on the flagstone facing the rising sun and continues with attendees reciting a creed, 5 Our Fathers and 5 Hail Marys on each side of the well.

[10][11] Shannon Rovers GAA, which incorporates Terryglass, Kilbarron and surrounding areas, is based in Páirc an Phobail, Ballinderry.