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Serdang Bedagai Regency is a regency on the east coast of North Sumatra Province of Indonesia, facing Malaysia, with 95 km of coastline and covering an area of 1,900.22 square kilometres, divided into seventeen districts (kecamatan), in turn subdivided into 243 villages. Its administrative centre is the town of Sei Rampah. The regency surrounds the independent city of Tebing Tinggi, and also contains a district (kecamatan) by the same name (Tebing Tinggi District surrounds the city on its west side, while Tebing Syahbandar District surrounds the city on its east side). The name "Serdang Bedagai" was derived from the two Sultanates which formerly existed in the Region; they were Serdang Sultanate and Padang Bedagai Sultanate. The population was 592,922 at the 2010 Census, while the 2020 Census produced a total of 657,490; the official estimate as of mid 2025 was 700,077 (comprising 352,386 males and 347,691 females).

ki|Turis Eropa sedang berwisata di pantai di sekitar Perbaungan (1907-1931).

Proses lahirnya undang-undang tentang pembentukan Sergai (Serdang Bedagai) sebagai kabupaten pemekaran merujuk pada usulan yang disampaikan melalui Keputusan Dewan Perwakilan Rakyat Daerah Provinsi Sumatra Utara Nomor 182002 tanggal 21 Agustus 2002 tentang Persetujuan Pemekaran Kabupaten Deli Serdang.

Kemudian Keputusan Dewan Perwakilan Rakyat Daerah Kabupaten Deli Serdang Nomor 26DPRD/2003 tanggal 10 Maret 2003 tentang Persetujuan Dewan Perwakilan Rakyat Daerah Kabupaten Deli Serdang Atas Usul Rencana Pemekaran Kabupaten Deli Serdang Menjadi 2 (dua) Kabupaten (Kabupaten Deli Serdang (induk), dan Kabupaten Serdang Bedagai). Kabupaten yang luasnya mencapai 1.900,22 kilometer persegi ini, terdiri atas 243 desa/kelurahan yang berada dalam 17 kecamatan.