Barisal Guns refer to a series of loud sonic booms heard near the Barisal

Barisal District

Barisal is a district in southern Bangladesh. It is also the headquarters of Barisal Division.-Geography and climate:Latitude: 22.75, Longitude: 90.36, Altitude: 4....

 region of East Bengal

East Bengal

East Bengal was the name used during two periods in the 20th century for a territory that roughly corresponded to the modern state of Bangladesh. Both instances involved a violent partition of Bengal....

 (currently in Bangladesh

Bangladesh

Bangladesh , officially the People's Republic of Bangladesh is a sovereign state located in South Asia. It is bordered by India on all sides except for a small border with Burma to the far southeast and by the Bay of Bengal to the south...

) in the 19th century. The sound is classified as mistpouffers

Mistpouffers

Mistpouffers are unexplained reports that sound like a cannon or a sonic boom. They have been heard in many waterfront communities around the world such as the banks of the river Ganges in India, the East Coast and inland Finger Lakes of the United States, as well as areas of the North Sea, Japan...

 -- i.e. sound like a cannon or a sonic boom. Similar sounds have been reported in many waterfront communities around the world such as the banks of the river Ganges in India, the East Coast and inland Finger Lakes of the United States, as well as areas of the North Sea, Japan and Italy; and sometimes away from water.

T.D. LaTouche reported in 1890 that the sounds were heard at various locations in the Ganges Delta

Ganges Delta

The Ganges Delta is a river delta in the South Asia region of Bengal, consisting of Bangladesh and the state of West Bengal, India. It is the world's largest delta, and empties into the Bay of Bengal...

and Brahmaputra River delta.
A rock band in United States was named after the phenomenon.