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Banggai Sea Regency is a regency in the province of Central Sulawesi, Indonesia. The regency was established on 14 December 2012, partitioned from the Banggai Islands Regency. It comprises the southern part of the Banggai Islands archipelago, including the main island of Banggai itself (including 40 offshore islets), the islands of Labobo and Bangkurung to the southwest of Banggai Island, and the numerous small Bowokan Islands (Kepulauan Bokan) to the southeast; it does not include the larger island of Peleng to the north (between Banggai Island and the mainland of Sulawesi) which substantially comprises the residual Banggai Islands Regency.

The new Banggai Sea Regency covers a land area of 725.67 km2 (and an associated marine area of 12,156.78 km2), and the districts now comprising the new Regency had a population of 62,183 at the 2010 Census and 70,435 at the 2020 Census; the official population estimate as at mid 2025 was 78,618 (comprising 39,718 males and 38,900 females).

Banggai has a tropical rainforest climate (Af) with moderate rainfall from September to December and heavy to very heavy rainfall from January to August.