The Garren Brook is a small river in

Herefordshire Herefordshire ( ) is a Ceremonial counties of England, ceremonial county in the West Midlands (region), West Midlands of England, bordered by Shropshire to the north, Worcestershire to the east, Gloucestershire to the south-east, and the Welsh ...

England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...

which rises beneath the eastern slopes of

Garway Hill Garway is a civil parish in south-west Herefordshire, England. The population of the civil parish was 430 at the 2011 census. It is set on a hillside above the River Monnow about 6 1/4 miles (10 km) northwest of Monmouth. It is a sparsel ...

. It flows east to the hamlet of

Orcop Orcop is a village and civil parish in the county of Herefordshire, England. It lies south of Hereford. It has a well-preserved early Norman motte-and-bailey castle and a church dedicated to St. John the Baptist which has a chancel built arou ...

where it turns south, taking a series of incised meanders past

St Weonards St Weonards () is a village and civil parish in Herefordshire, England, located south of Hereford, west of Ross-on-Wye and north of Monmouth, on the A466 road. Within the parish and also on the A466 is the hamlet of Sandyway. St Weonards li ...

before turning east again, then south past

Llangarron Llangarron is a small village and civil parish in southwest Herefordshire within of both Ross-on-Wye (Herefordshire, England) and Monmouth (Monmouthshire, Wales). The population of the civil parish at the 2011 census was 1,053. The civil paris ...

, again in a series of incised meanders. Southeast of there it enters the right bank of the

River Wye The River Wye (; ) is the Longest rivers of the United Kingdom, fourth-longest river in the UK, stretching some from its source on Plynlimon in mid Wales to the Severn Estuary. The lower reaches of the river forms part of Wales-England bor ...

at Old Forge. Its largest tributary is the left bank stream known as The Gamber which enters it at Trehumfrey north of Llangarron, having originated on the north side of Orcop Hill. Other right bank tributaries include the Llantywaun and Llanerch brooks. It flows over a landscape formed in the

mudstone Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from ''shale'' by its lack of fissility.Blatt, H., and R.J. Tracy, 1996, ''Petrology.'' New York, New York, ...

s and

sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...

s of the St Maughans and Brownstones formations of the

Old Red Sandstone Old Red Sandstone, abbreviated ORS, is an assemblage of rocks in the North Atlantic region largely of Devonian age. It extends in the east across Great Britain, Ireland and Norway, and in the west along the eastern seaboard of North America. It ...

References

{{coord, 51.86214, -2.64096, type:river_region:GB, format=dms, display=title Garren Brook 2Garren