<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e6f95-63d9-79ef-9848-fb99b9173f6a,g:2a510059-1337-4f0f-93e9-afe7d9a13539-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://investors.neptuneflood.com/role/Cover" xlink:type="simple" xlink:href="np-20260528.xsd#Cover"/>
  <link:presentationLink xlink:role="http://investors.neptuneflood.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e6f95-63d9-7564-aed2-f4fbdda682d9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_DocumentType_019e6f95-63d9-7564-aed2-f4fbdda682d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019e6f95-63d9-78c3-8ecb-5fd370af9072" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_DocumentPeriodEndDate_019e6f95-63d9-78c3-8ecb-5fd370af9072" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e6f95-63d9-7913-a30c-93790dc5bb89" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityRegistrantName_019e6f95-63d9-7913-a30c-93790dc5bb89" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019e6f95-63d9-7c02-8883-a201fb5d7d96" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019e6f95-63d9-7c02-8883-a201fb5d7d96" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019e6f95-63d9-7517-b6b3-ed794ae04b1e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityFileNumber_019e6f95-63d9-7517-b6b3-ed794ae04b1e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e6f95-63d9-7f81-8bbd-dec013c9f1b1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e6f95-63d9-7f81-8bbd-dec013c9f1b1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019e6f95-63d9-7cdd-89c7-b9c6eacad3ca" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityAddressAddressLine1_019e6f95-63d9-7cdd-89c7-b9c6eacad3ca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019e6f95-63d9-7808-b43e-3cd48ef0e610" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine2"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityAddressAddressLine2_019e6f95-63d9-7808-b43e-3cd48ef0e610" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019e6f95-63d9-72f4-9584-f01bb44ed2a3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityAddressCityOrTown_019e6f95-63d9-72f4-9584-f01bb44ed2a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019e6f95-63d9-7e96-809b-e03d803c1907" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityAddressStateOrProvince_019e6f95-63d9-7e96-809b-e03d803c1907" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019e6f95-63d9-773a-ba6d-d317aa2e6ebf" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityAddressPostalZipCode_019e6f95-63d9-773a-ba6d-d317aa2e6ebf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019e6f95-63d9-7662-b709-c69160ba7764" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_CityAreaCode_019e6f95-63d9-7662-b709-c69160ba7764" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019e6f95-63d9-76d0-bae5-e39190a28280" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_LocalPhoneNumber_019e6f95-63d9-76d0-bae5-e39190a28280" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019e6f95-63d9-7a88-a838-c97ee3cd0b45" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_WrittenCommunications_019e6f95-63d9-7a88-a838-c97ee3cd0b45" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019e6f95-63d9-759d-ac1b-cb733f3fe067" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_SolicitingMaterial_019e6f95-63d9-759d-ac1b-cb733f3fe067" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019e6f95-63d9-7c28-97b4-92173f67bdc2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_PreCommencementTenderOffer_019e6f95-63d9-7c28-97b4-92173f67bdc2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019e6f95-63d9-7405-ae89-d6c025e4b836" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019e6f95-63d9-7405-ae89-d6c025e4b836" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019e6f95-63d9-710f-8054-343d4ace26b6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_Security12bTitle_019e6f95-63d9-710f-8054-343d4ace26b6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019e6f95-63d9-7404-be38-c5fbaf7bd714" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_TradingSymbol_019e6f95-63d9-7404-be38-c5fbaf7bd714" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019e6f95-63d9-719a-900a-e99b34fbeeb0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_SecurityExchangeName_019e6f95-63d9-719a-900a-e99b34fbeeb0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019e6f95-63d9-730e-986e-266bc9553d9f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityEmergingGrowthCompany_019e6f95-63d9-730e-986e-266bc9553d9f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityExTransitionPeriod_019e6f95-63d9-7295-82c3-caf57ee48acf" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityExTransitionPeriod"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityExTransitionPeriod_019e6f95-63d9-7295-82c3-caf57ee48acf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e6f95-63d9-7fdf-902f-026cc22ec8a7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_AmendmentFlag_019e6f95-63d9-7fdf-902f-026cc22ec8a7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e6f95-63d9-76c0-81dc-9c2adbe217c4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="24" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e6f95-63d9-7196-b2fb-b32707443912" xlink:to="loc_dei_EntityCentralIndexKey_019e6f95-63d9-76c0-81dc-9c2adbe217c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
