Fontburn is a drinking water reservoir situated 10 miles (16 km) northwest of the market town of Morpeth, and immediately to the east of Harwood Forest in Northumberland, England.

The north shore is mainly vegetated with scrub and woodland, including willow, blackthorn, elder, birch, hawthorn, and hazel.

At the extreme south eastern corner of the site there is an area of marshy grassland with abundant meadow-sweet, wild angelica, common knapweed, and sneezewort and where there is periodic flooding of the shore you can also find species like common spike rush, reed canary grass, lesser spearwort, and amphibious bistort.

[2] A Site of Special Scientific Interest, Fallowlees Flush, lies immediately to the west of Fontburn, on the slopes of one of its tributary streams.

As one of the operator's smaller sites, Fontburn Reservoir claims "a reputation as being a friendly, family orientated fishery".