Bulla Island, also Xara Zira, Khara Zira or Khere Zire, (Azerbaijani: Xǝrǝ Zirǝ Adası) is an island south of the Bay of Baku, Caspian Sea.

[2] The island has akdalaite and aluminium deposits and a mud volcano.

[3] Bulla Island lies south of the bay, detached from the group, to the ENE of the town of Alat, about 13 km (8 mi) from the nearest shore.

[4] 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 billion cubic metres) of gas reserves.