An Abandoned Base is a group of derelict buildings and/or facilities, looking like they has been once used by humans, but now are completely non-operational. Abandoned bases are scattered about the game world and serve as a source of materials and components (coming handy at the early game stage when Player has low production capacity) and, most important, seeds, circuit boards, and abandoned tablets.
An Abandoned Base is displayed on the map as a grey blob, changing color towards red in the process of looting/deconstruction by Player.