Satellite detected water extents in Adamawa, Borno, Gombe, Taraba and Yobe States, Nigeria as of 29 July 2025

**UNOSAT code: FL20220728NER** This map illustrates satellite-detected surface waters in Dosse, Niamey and Tillabéri Regions, Niger as observed from a Sentinel-2 image acquired on 11 August 2022 at 11:27 local time. Within the analyzed area of about 45,000 km2, about 330 km2 of lands appear to be flooded. Based on Worldpop population data and the detected surface waters in the analyzed area, about 75,000 people are potentially exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

**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: 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).

**UNOSAT code FL20221004NER** This map illustrates satellite-detected surface waters in Tillabéri & Niamey Regions, Niger as observed from a Sentinel-2 image acquired on 05 October 2022 at 11:27 local time. Within the extent of this map of about 40,000 km2, about 180 km2 of lands appear to be flooded. Based on Worldpop population data and the detected surface waters within the map extent, about 50,000 people are potentially exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

**UNOSAT code FL20221004NER** This map illustrates satellite-detected surface waters in Dosso Region, Niger as observed from a Sentinel-2 image acquired on 05 October 2022 at 11:27 local time. Within the extent of this map of about 12,500 km2, about 225 km2 of lands appear to be flooded. Based on Worldpop population data and the detected surface waters within the map extent, about 35,000 people are potentially exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

**UNOSAT code: FL20220728NER** This map illustrates satellite-detected surface waters in Tillabéri Region, Niger as observed from a Sentinel-2 image acquired on 19 August 2022 at 11:37 local time. Within the analyzed area of about 26,000 km2, about 377 km2 of lands appear to be flooded. Based on Worldpop population data and the detected surface waters in the analyzed area, about 33,500 people are potentially exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).