The North Brook rises near
Cottesmore and flows in an easterly direction through
Greetham before turning southwards past the site of the former Greetham Mill. It then flows through a deep gully and into the parkland of
Exton Hall where it has been dammed to create two ornamental lakes. On the western side of the upper lake stands Fort Henry, a pleasure-house built in 1788 in the elegant Gothick style. After the lower of the two lakes it passes to the west of the deserted medieval village of
Horn, before flowing under the remains of the Exton Park wall. Shortly afterwards, it is joined by a small unnamed tributary which flows through Ry Gate Lake in the grounds of Exton Hall, and later through the bed of a drained lake near Cuckoo Spinney. The North Brook continues in a southerly direction by Horn Mill, now a trout hatchery, through
Empingham Marshy Meadows SSSI to
Empingham where it joins the
River Gwash near the site of the former Empingham Mill. ==References==