Great Yews

River Avon System is a 475.9-hectare (1,176-acre) biological Site of Special Scientific Interest in Hampshire and Wiltshire, southern England. It is a Nature Conservation Review site, Grade I. It is part of the Avon Valley and New Forest Ramsar sites and is also part of two Special Protection Areas: Solent and Southampton Water, and the New Forest.This site consists of stretches of the River Avon and its tributaries, which are described by Natural England as "of national and international importance for their wildlife communities". It has more than 180 species of aquatic plants and one of the most diverse fish species in the country. There is also a rich invertebrate fauna and mammals include water voles and water shrews.

Homington and Coombe Bissett Downs (grid reference SU104245) is a 25.0 hectare biological Site of Special Scientific Interest in Wiltshire, notified in 1971. Coombe Bissett Downs is managed as a nature reserve by Wiltshire Wildlife Trust.

Odstock Down (grid reference SU139250) is a 12.1 hectare biological Site of Special Scientific Interest in Wiltshire, England, above the village of Odstock. It was notified in 1975.

Whitsbury Castle, or Whitsbury Castle Ditches, is the site of an Iron Age univallate hillfort located near the village of Whitsbury in Hampshire. The fort is roughly pear-shaped, located on a chalk outcrop, and covering approximately sixteen acres. The defenses comprise two large ramparts with outer ditches and an additional counter scarp bank on the northern half. The original entrance was at the southwestern corner but has been destroyed by the construction of a post-medieval manor house. The site has been in use throughout the ages, with excavation revealing mesolithic activity, an association with a Bronze Age ranch boundary, an Iron Age hillfort settlement, followed much later by Anglo-Saxon renovation and reuse of the defences. The site is privately owned but is flanked externally on all sides but east by public bridleways. The site is listed as a scheduled ancient monument no.94.

Coombe Bissett is a village and civil parish in the English county of Wiltshire in the River Ebble valley, 3 miles (4.8 km) southwest of Salisbury on the A354 road that goes south towards Blandford Forum. The parish includes the village of Homington, to the east towards the village of Odstock.

Stratford Toney Down (grid reference SU095246) is a 23.1 hectare biological Site of Special Scientific Interest in Wiltshire, England, which was notified in 1987. The site lies in a shallow dry valled in the south of Stratford Tony parish, about 5 miles (7.5 km) south-west of Salisbury. It is important for the botanically rich chalk grassland – mainly sheep's fescue and meadow oat-grass – which supports several nationally rare plant and butterfly species.

Whitsbury is a village and civil parish in Hampshire, England, close to Fordingbridge. Whitsbury is a part of a group of villages on the edge of the Cranborne Chase and West Wiltshire Downs Area of Outstanding Natural Beauty.

Mizmaze (or Miz-Maze or Miz Maze) is the name given to two of England's eight surviving historic turf mazes, and also to a third, presumably once similar site (at Leigh in Dorset) that is now merely a relic. Of the two which survive, one is at Breamore, in Hampshire; the other is on top of St Catherine's Hill, overlooking the city of Winchester, Hampshire. A mizmaze forms a pattern unlike conventional mazes and is classed as a labyrinth because the path has no junctions or crossings. The pattern appears more like a very long rope, neatly arranged to fill the area.

Rockbourne is a village and civil parish in the English county of Hampshire, close to Fordingbridge.

Clearbury Down (grid reference SU152240) is a 13.3 hectare biological Site of Special Scientific Interest in Wiltshire, England. It is above the village of Charlton-All-Saints in the parish of Downton, south of Salisbury. The site was notified in 1971.

Odstock is a village and civil parish 3 miles (4.8 km) south of Salisbury in Wiltshire, England. The parish includes the village of Nunton with its nearby hamlet of Bodenham. The parish is in the valley of the River Ebble, which joins the Hampshire Avon near Bodenham. In the woods about Odstock are earthworks. The meaning of the name is probably "Odo's stockade".Odstock Down is a biological Site of Special Scientific Interest.

Clearbury Ring is a univallate Iron Age hillfort which is partly in the parish of Downton in the county of Wiltshire in south-west England, approximately 5 kilometres (3 mi) due south of Salisbury city centre. The site, which is a scheduled monument, straddles the boundary with Odstock parish, and a slight scarp runs across the interior of the fort, marking the parish boundary.The fort occupies a prominent hilltop overlooking the valley of the River Avon, at an altitude of 142 metres (466 ft) above mean sea level. The hillfort is immediately adjacent to the Clearbury Down Site of Special Scientific Interest, but is not included within it.Clearbury Ring encloses an area of approximately 2 hectares (4.9 acres); the rampart is well preserved and consisted of a single bank with a ditch outside it. The fort had a single entrance on the north-west side, consisting simply of a 10-metre (33 ft) wide gap with a causeway across the ditch. Traces of a quarry are evident within the fort's interior. The fort is overgrown with tree cover. In 1632, Clearbury Ring was recorded as Clereburu. A paleolithic hand axe was found here. To the south-west of the fort are the remains of a lynchet, consisting of a steep 2-metre (6 ft 7 in) high scarp that runs parallel to the fort's defences. Two other lynchets have been identified near the fort, although they are not as well-preserved, together with faint traces of ancient field boundaries.