Šance, Nature reserve in Točná and Praha-Zbraslav, Czech Republic.

Šance is a protected nature reserve spanning the Točná and Praha-Zbraslav districts at roughly 385 meters elevation. The landscape mixes dense forest sections with open meadows, connected by walking paths that explore both woodland and grassland areas.

The reserve was declared on 1 July 1982, largely on the strength of finds by the 19th-century entomologist František Antonín Nickerl. A 1991 decree re-declared it within the Modřanská rokle – Cholupice quiet zone, and on 5 November 2013 it was enlarged to include Břežanské údolí, protecting the habitat of the moth Euplagia quadripunctaria and bringing the site into Natura 2000.

The name Šance comes from the Latin-era ramparts called šance, up to 25 metres wide, built by the Celts on the hilltop. A marked nature trail set up by the Czech Union for Nature Conservation with Prague's magistrate and Konopiště foresters leads through the reserve.

A marked educational trail through the reserve was set up by the Czech Union for Nature Conservation with funding from Prague City Hall and support from Lesy ČR, the Konopiště forest district. The terrain is rocky in places, so wear sturdy footwear and stay on the marked route.

Šance is the smaller of the two parts of the Celtic oppidum Závist, on the right bank of the Vltava. The ramparts of stone and earth reached up to 25 metres in width, and the ditch along the northern side is still up to four metres deep.