Havránka, Natural monument in Praha-Troja, Czech Republic.

Havránka is a protected natural monument on the right bank of the Vltava River with two separate areas covering about 4.3 hectares in total. One area features former vineyard land, while the other contains a stream valley with springs and grasslands.

Havránka is a natural monument, ev. no. 759, in Troja, Prague. Its Pustá vinice section probably held one of Troja's oldest vineyards. In 2000 radical clearing of shrubs allowed protected Gagea bohemica to be recorded in 2001. In 2006 the Botanical Garden had erosion gullies filled with topsoil, which caused weed growth and degradation still visible in 2008.

The name Haltýř comes from a wooden shelter built over a spring; its soaked wood cooled the air inside and served to store food. The spring below once supplied drinking water to Troja Castle through a wooden pipe. Today the Prague Botanical Garden runs a three-kilometre educational trail with nine information boards through the area outside the paid garden.

The 3 km educational trail, set up by the Prague Botanical Garden, has nine stops with information boards and runs outside the garden's paid section. A green KČT hiking mark crosses the area. From the upper plateau of Pustá vinice the path climbs to the Velká skála nature monument; downhill it leads to the Kovárna bus stop (line 112).

The name haltýř refers to a wooden shelter built over a spring; the wood soaks up water, which evaporates and cools the interior, so it once served to store food. A half-rotted remnant of the old haltýř still covers the springs at Haltýř, which also supplied drinking water to Troja Castle through a wooden pipeline.