Bihanga Island is located at Patharghata Upazila in Barguna District. It is an island of Baleshwari River. Although the island was discovered long ago, it was recently named Bihanga Island. The name Bihanga in Bengali language means "bird". To the locals it is known as the Dhanseer Char. At one time, the island had a lot of Dhanshee plants. It is located close to the World Heritage Sunderbans.