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[[Africa Groundwater Atlas Home | Africa Groundwater Atlas]] >> [[Hydrogeology by country | Hydrogeology by country]] >> Hydrogeology of the Gambia
 
[[Africa Groundwater Atlas Home | Africa Groundwater Atlas]] >> [[Hydrogeology by country | Hydrogeology by country]] >> Hydrogeology of the Gambia
  
[[File:CC-BY-SA_logo_88x31.png | frame | This work is licensed under a [https://creativecommons.org/licenses/by-sa/3.0/ Creative Commons Attribution-ShareAlike 3.0 Unported License]]]
 
  
 
The Republic of the Gambia is the smallest mainland African country. By the 14th century, most of what is now Gambia was part of the Mali empire. From the 15th century, many European powers established trading posts in the Senegambia area, which included the Malinke and Wolof kingdoms and was also inhabited by the pastoral nomadic Fulani who are found throughout West Africa. Portuguese traders were followed by colonial rule from first Britain, then France, then Britain again from the late 16th century. The Gambia won independence in 1965, and saw relatively stable government until an attempted coup in 1981, in the aftermath of which the Gambia and Senegal formed the Senegambia Confederation in 1982. The Gambia withdrew from the confederation in 1989. Another military uprising in 1994 saw the first change in president since independence, with a full return to democratic elections in 2001. The second president was ousted in elections in 2017. Gambia left the Commonwealth in 2013 and applied to return in 2018.  
 
The Republic of the Gambia is the smallest mainland African country. By the 14th century, most of what is now Gambia was part of the Mali empire. From the 15th century, many European powers established trading posts in the Senegambia area, which included the Malinke and Wolof kingdoms and was also inhabited by the pastoral nomadic Fulani who are found throughout West Africa. Portuguese traders were followed by colonial rule from first Britain, then France, then Britain again from the late 16th century. The Gambia won independence in 1965, and saw relatively stable government until an attempted coup in 1981, in the aftermath of which the Gambia and Senegal formed the Senegambia Confederation in 1982. The Gambia withdrew from the confederation in 1989. Another military uprising in 1994 saw the first change in president since independence, with a full return to democratic elections in 2001. The second president was ousted in elections in 2017. Gambia left the Commonwealth in 2013 and applied to return in 2018.  
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The geology map on this page shows a simplified version of the geology at a national scale (see the [[Geology | geology resource page]] for more details).  
 
The geology map on this page shows a simplified version of the geology at a national scale (see the [[Geology | geology resource page]] for more details).  
  
[https://www.bgs.ac.uk/africagroundwateratlas/downloadGIS.html '''Download a GIS shapefile of the Gambia geology and hydrogeology map'''].
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[[File:Gambia_Geology3.png | center | thumb|500px | Geology of the Gambia at 1:5 million scale. Developed from USGS map (Persits et al. 2002). For more information on the map development and datasets see the [[Geology | geology resource page]]]]
 
 
[[File:Gambia_Geology3.png | center | thumb|500px | Geology of the Gambia at 1:5 million scale. Developed from USGS map (Persits et al. 2002). For more information on the map development and datasets see the [[Geology | geology resource page]]. [https://www.bgs.ac.uk/africagroundwateratlas/downloadGIS.html Download a GIS shapefile of the Gambia geology and hydrogeology map].]]
 
  
  
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The hydrogeology map on this page shows a simplified version of the type and productivity of the main aquifers at a national scale (see the [[Hydrogeology Map | hydrogeology Map]] resource page for more details).
 
The hydrogeology map on this page shows a simplified version of the type and productivity of the main aquifers at a national scale (see the [[Hydrogeology Map | hydrogeology Map]] resource page for more details).
 
[https://www.bgs.ac.uk/africagroundwateratlas/downloadGIS.html '''Download a GIS shapefile of the Gambia geology and hydrogeology map'''].
 
  
 
There are two main aquifers in the Gambia: the upper Quaternary unconsolidated sands comprise a shallow sand aquifer (SSA), which is an important aquifer throughout the Gambia. The deeper Cretaceous sediments form a deep sandstone aquifer (DSA). More detail can be seen below.  
 
There are two main aquifers in the Gambia: the upper Quaternary unconsolidated sands comprise a shallow sand aquifer (SSA), which is an important aquifer throughout the Gambia. The deeper Cretaceous sediments form a deep sandstone aquifer (DSA). More detail can be seen below.  
  
[[File:Gambia_Hydrogeology3.png | center | thumb| 500px| Hydrogeology of the Gambia at 1:5million scale. For more information on how the map was developed see the [[Africa Groundwater Atlas Hydrogeology Maps | hydrogeology map]] resource page. [https://www.bgs.ac.uk/africagroundwateratlas/downloadGIS.html Download a GIS shapefile of the Gambia geology and hydrogeology map].]]
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[[File:Gambia_Hydrogeology3.png | center | thumb| 500px| Hydrogeology of the Gambia at 1:5million scale. For more information on how the map was developed see the [[Africa Groundwater Atlas Hydrogeology Maps | hydrogeology map]] resource page]]
  
  

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