Floods that occurred in early 2021 in the Barito watershed, South Kalimantan Province, were reported as a result of land cover changes that caused land degradation. This research is a literature study and aims to see how much land cover changes influenced the flood events. The method used is to overlap land cover maps and land system maps and add maximum rainfall data obtained from CHIRPS satellite data. The results showed that the rain that occurred in January 2021 was classified as very heavy and above the daily maximum average rain; therefore, it became flooding. When comparing the 1990 land cover to 2019, there has been a change in land cover within the Barito watershed. Forest land areas decreased, especially primary mangrove forest (92.1%), primary swamp forest (64.6%), and primary swamp forest (64.6%). On the other hand, the plantation areas increased by 1,113.3%. These changes resulted in a shift in the flood potential vulnerability, from moderately vulnerable into vulnerable, which occurred in 8 out of 10 districts in South Kalimantan that were flooded. Meanwhile, from the land system itself, three sub-districts almost 100% are floodplains, two sub-districts are more than 50% of the areas are floodplains, and all them are inundated during the January 2021 flood.