This compilation contains data from 18 mangrove sediment cores: organic carbon (Corg), total nitrogen (N) and stable carbon isotope composition (δ13Corg). For 3 cores, gamma emitting radionuclides data are additionally available. The cores were sampled in Segara Anakan Lagoon (Central Java), Berau (East Kalimantan) and Kongsi Island (Thousand Islands Marine National Park, Jakarta), in Indonesia. Sediment samples from Segara Anakan Lagoon and Kongsi Island were taken in October - December 2016. Sediment samples from Berau were taken in May 2013. The mangrove sediment cores were collected using a 1 m long semi-cylindrical auger. Sediments were taken down to 1 m depth, and were sampled in 5 cm intervals.

Supplement to: Kusumaningtyas, Mariska Astrid; Hutahaean, Andreas A; Fischer, Helmut W; Pérez-Mayo, Manuel; Ransby, Daniela; Jennerjahn, Tim C (2019): Variability in the organic carbon stocks, sources, and accumulation rates of Indonesian mangrove ecosystems. Estuarine, Coastal and Shelf Science, 218, 310-323