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BolsonIs a closed desert basin with no drainage outlet, surrounded by mountains.
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Bolsona mountain-ringed desert basin lacking any outlet for drainage.
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BolsonAn alluvium-floored basin, depression, or wide valley, mostly surrounded by mountains and drained by a system that has no surface outlet. Bolson fill is the alluvial detritus that fills a bolson--also commonly called bolson deposits.
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BolsonIn arid regions, a basin filled with alluvium and intermittent playa lakes and having no outlet.
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