The island spans an area of 1.14 acres and it is surrounded by forest and a river named Tunga.

Mandagadde is one of the 20 important sanctuaries in the country and attracts birds in large numbers between July and September.

Several species of birds lay eggs on the island in sanctuary during July to September, with peak season of August.

The birds prefer the top branches of the trees for nesting as the island is partially submerged by the swollen river Tunga during monsoon.

[2] The quaint little island is also graced by the presence of various other varieties, such as the Maiden Egret, Pied Kingfisher, Wooly Neck Stalk, Night Herons, Open-billed storks etc.