Dervisha, Managed nature reserve near Veliki Preslav, Bulgaria.

Dervisha is a managed nature reserve stretching along both banks of the Dervishka river gorge, encompassing different ecological zones with distinct plant communities. The protected area covers 11.21 hectares and features forests, rocky outcrops, and flowing water that shape the landscape.

Dervisha was declared a nature reserve on 23 October 1948, covering 10.6 hectares. On 15 October 1999 it was recategorised as a managed reserve, keeping the same area, and on 30 May 2006 its territory was enlarged to 11.2136 hectares. The reserve was created to protect the country's only natural stand of horse chestnut, a remnant of a formerly extensive chestnut forest.

The name comes from the Dervish Pass that once crossed this ground. Today an eco-trail runs through the reserve from Veliki Preslav to the village of Ivanovo, following the two rivers, the Dervishka and the Zurleva. Sanitary felling is permitted only when more than 5% of the stand is drying out.

An eco-trail runs through the reserve from Veliki Preslav to the village of Ivanovo, following the Dervishka and Zurleva rivers. The reserve lies about 5 km from Veliki Preslav on the northern slope of Preslav Mountain, between 140 and 200 m above sea level.

The reserve exists because of the horse chestnut: it holds Bulgaria's only natural stand of the species, a remnant of a much larger chestnut forest that once covered the slopes. Some trees here reach 35 metres in height, and the protected area grew from 10.6 hectares in 1948 to 11.2136 hectares in 2006.