Satellite detected water extent along the Komadugu Gana River, Bursari & Tarmua Local Government Area, Nigeria as of 15 September 2024

**UNOSAT code: FL20240902NGA, GDACS ID: 1102720** This map illustrates cumulative satellite-detected water using VIIRS in Nigeria between 5 to 9 September 2024. Within the cloud free analyzed areas of about 815,000 km², a total of about 14,000 km² of lands appear to be affected with flood waters. Based on Worldpop population data and the maximum flood water extent, about 2,650,000 people are potentially exposed or living close to flooded areas. The pixelwise water fraction from VIIRS, using a 5-day composite at 375 m spatial resolution, indicates potential floodwater coverage ranging from 0% to 100%. This large-scale analysis is intended for guidance purposes and has not yet been validated with ground truth data or higher-resolution analysis. The population exposure analysis is based on floodwaters observed only in cloud-free areas, so the total number of people exposed may be underestimated. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).

**UNOSAT code FL20221019NGA** This map illustrates cumulative satellite-detected water using VIIRS in Nigeria between 13 to 17 October 2022 compared with the period from 08 to 12 October 2022. Within the cloud free analysed areas of about 890,000 km², a total of about 30,000 km² of land appears to be affected. In the analysed areas, 738 health facilities and 1,424 schools are identified to be within or close to a flooded zone. In comparison with the period between 08 to 12 October 2022, water extent appears to have decreased of about 1,000 km². Based on Worldpop population data and the maximal flood water extent ~6,660,000 people are potentially exposed or living close to flooded areas amongst the 204 million people living in the analysed zone. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).

**UNOSAT code: FL20240902NGA, GDACS ID: 1102720** This application provides flood impact assessments for Nigeria in September 2024.

**UNOSAT code: FL20250928NGA, GDACS ID: 1103409** This map illustrates the satellite-detected water extent in Adamawa, Borno, Gombe, Taraba and Yobe States, Nigeria, as observed from Sentinel-2 satellite images acquired on 29 July 2025 at 14:28 local time (13:28 UTC). Within the analyzed area of approximately 47,000 km², about 700 km² of land appears to be affected by floodwaters. Based on WorldPop population data and the flood extent, approximately 19,000 people are potentially exposed or living close to the flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).

**UNOSAT code FL20221019NGA** This map illustrates cumulative satellite-detected water using VIIRS in Nigeria between 1 to 25 October 2022 compared with the period from 1 to 30 September 2022. Within the cloud free analysed areas of about 912,000 km², a total of about 48,300 km² of land appears to be affected. In the analysed areas, 1,370 health facilities and 2,730 schools are identified to be within or close to a flooded zone. In comparison with the period between 1 to 30 September 2022, water extent appears to have increased of about 2,300 km². Based on Worldpop population data and the maximal flood water extent ~12,200,000 people are potentially exposed or living close to flooded areas amongst the 220 million people living in the analysed zone. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).

**UNOSAT code: FL20240902NGA, GDACS ID: 1102720** This map illustrates cumulative satellite-detected water using VIIRS in Nigeria between 09 to 13 November 2024. Within the cloud free analysed areas of about 900,000 km², a total of about 22,000 km² of lands appear to be affected with flood waters. Maximum flood water extent appears to have receded of about 5,700 km² since the period between 27 to 31 October 2024. Based on Worldpop population data and the maximum flood water extent, about 5.8 million people remain potentially exposed or live close to flooded areas. The pixelwise water fraction from VIIRS, using a 5-day composite at 375 m spatial resolution, indicates potential floodwater coverage ranging from 0% to 100%. This large-scale analysis is intended for guidance purposes and has not yet been validated with ground truth data or higher- resolution analysis. The population exposure analysis is based on floodwaters observed only in cloud-free areas, so the total number of people exposed may be underestimated. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).