upper delta plain

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In delta
…landward section is called the upper delta plain, the middle one the lower delta plain, and the third the subaqueous delta, which lies seaward of the shoreline and forms below sea level.
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In river: Morphology of deltas
This point source of the upper delta plain can be thought of as the apex of the entire delta, which is analogous to the same reach of an alluvial fan. The entire upper delta plain is fluvial in origin except for marshes, swamps, and freshwater lakes that exist in areas…
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