First recorded on the 1839 Ordnance Survey map, this raised platform measures approximately 53 metres east to west and 21 metres north to south. The site still retains portions of its original defensive moats along the northern and southern sides; these water-filled ditches are between 6 and 8 metres wide and reach depths of about 1.6 metres.

The site's long history has seen considerable change since its medieval origins. When the railway was constructed, it cut through the eastern portion of the interior, permanently altering the site's original layout. For many years, the area was covered in mixed woodland, preserving the earthworks beneath a canopy of trees. However, by 2005, development had reached this historic spot, with a farm building constructed directly on top of the raised platform.

This type of moated site is relatively common across Ireland and Britain, typically dating from the 13th to 14th centuries. They were usually constructed by Anglo-Norman settlers or prosperous farmers who built their homes on raised platforms surrounded by water-filled ditches for defence and drainage. The Sparrowsland example, despite its modifications over the centuries, remains an important piece of Wexford's medieval landscape, offering tangible evidence of how the county's early settlers lived and protected themselves.