Astrea is a municipality and town of the Department of Cesar in northern Colombia.

The region is part of the geological Zambrano formation, formed in the Neogene presenting a gray-greenish clay.

On November 26, 1984, Astrea segregated from Chimichagua and became a municipality of the Department of Cesar by Ordinance 013 of 1984.

Agricultural products are commercialized in the town such as; yuca, sesame, corn and common bean among others.

Astrea also celebrates a traditional feast honoring the Día de San Martín (St. Martin's Day) every November 11.