Bassetts Mead, an area of just over 10 hectares of open public open space, lies to the east of Holt Park. It became a SANG in 2011 and is currently managed by the Hampshire Wildlife Trust for recreation and biodiversity, on behalf of Hook Parish Council.
Bassetts Mead has the River Whitewater, a chalk stream, flowing along the eastern boundary. The habitats on-site comprise grazing meadow and floodplain habitat along with ponds, mature trees and woodland and bankside vegetation. The area is used by dog walkers and bird watchers alike and there is a circular walk around the site: Bassetts Mead Walk