Bulla Island
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Bulla Island (Kharra Zira, Azeri: Bulla adası (Xərə Zirə)) is the largest island in the Caspian Sea within the Absheron Peninsula region (area: 3,5 km², maximum length: 3,4 km, width: 2,6 km). The island has akdalaite and aluminium deposits and a mud volcano.
The island is a centre for the nearby offshore gas development of the Bulla Deniz gas field, in production since 1968. It was the largest gas find in Azerbaijan before Shah-deniz and contains more than 4 trillion cubic feet (110 km³) of gas reserves.
In 1973 the scientific employee Mamedov found 21 spheres each with a diameter of 60-70 millimeters. Spheres were "collected" each of two parts between which there was a "seam" on which it easily breaks up. The spheres consisted from light drop-shaped and dark particles[1].