Bichnakandi, Natural stone formations in Sylhet, Bangladesh.

Bichnakandi is a stone quarry area in Rustompur Union, Gowainghat Upazila, Sylhet District, where layers of the Khasi mountains from both sides meet at one point. Streams from the Khasi Hills form a lake connected to the Piyain River, and natural rocks come down with the water.

Bichnakandi takes its name from the Bengali words bichhana (bed) and kandi (dam or cluster), after the stones piled like a bed. The site is a quarry where rock carried down by hill streams from the Khasi Mountains is collected from the riverbed. The Umkrem stream descends from the Khasi Hills, forms a lake here, and joins the Piyain River about three kilometres to the south-east.

The name joins bichhana, Bengali for bed, and kandi, a dam or cluster, after the stones piled like a bed. In Sylheti the first element is bisna, which gives the variant Bisnakandi. Visitors also see the Umkrem stream from the Khasi Hills forming a lake before it runs about three kilometres southeast into the Piyain River.

Bichnakandi sits in Rustompur Union, Gowainghat Upazila, at the end of a road from Sylhet; the last stretch is rough and often done by local transport or on foot. The site is a working stone quarry beside the Piyain River, so expect loose rock underfoot and trucks loading stones. The Umkrem stream from the Khasi Hills feeds a small lake here before joining the Piyain about three kilometres southeast.

Two tectonic plates meet in this region, creating geological conditions similar to major fault lines. This makes the area interesting for scientists studying Earth's crust behavior.