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Bidar Fort is situated in Bidar city of the northern plateau of Karnataka, India. The fort, the city and the district are all affixed with the name Bidar. Sultan Alla-Ud-Din Bahman of the Bahmanid Dynasty shifted his capital from Gulbarga to Bidar in 1427 and built his fort along with a number of Islamic monuments. There are over 30 monuments inside Bidar fort.

The present-day Bidar fortress was rebuilt using red laterite stone around the old fort in 1428 by Ahmed Shah Bahmani. Constructed on the edge of the plateau, Bidar fort has a haphazard rhombus-shaped layout. The fort is 0.75 miles long by 0.5 miles in breadth (1.21 km long by 0.80 km).[citation needed] The fort walls measure 2.5 km (1.6 mi) on the outside, and include within numerous buildings, arches, pavilions, mosques, gateways and gardens. To the north and east, steep cliffs provide natural protection to the moat and the glacis; elsewhere, facing Bidar city, from the south-east to the south-west, the walls are protected by a unique triple-channeled moat, described by Yazdani (1995).

One of the most unusual features of Bidar is the historic water supply system, called karez, (also known as qanat), which is a water harnessing technology that originated in Persia.

The technology was brought to the Deccan by the Bahmani kings of the 15th Century CE, the karez system was built by Bahmani kings in 15th Century in Naubad village in Bidar, in Gulbarga and Bijapur districts in Karnataka and also in Burhanpur district in Madhya Pradesh. Muslim dynasties, with ruling class descending from Persia or having influential connections with Persian kings may have invited expert engineers from Persia.

The karez consists basically of a network underground canals, punctuated by vertical shafts to the surface, The karez taps into the ground water sources (or natural springs) and transports it through the underground tunnel to the settlement, ending in a surface canal and/or pools in the village for various uses like drinking, washing, ablution, watering livestock, and also further used for irrigating fields, orchards and gardens.

The rocky soil in Bidar makes access to drinking water very difficult and the karez was built in order to provide drinking water to civilian settlements and the garrison inside the Bidar fort. The system in Bidar has 21 vertical shafts, and extends for about 2 kilometres (1.2 mi). A few karez shafts have been closed by builders and developers, leaving only 17 visible today.