We present a database containing Native Forest and Deforested remote sensing time series for the Argentine Chaco Forest for the period 2000 - 2020. Deforested time series have the deforestation date indicated with a monthly resolution between 2002 - 2016. This database was created with a near real-time deforestation detection task in mind. We show that this database is appropriate for that purpose, and later we explore other applications.Sociedad Argentina de Informática e Investigación Operativa