"river dune" meaning in English

{
  "forms": [
    {
      "form": "river dunes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "river dune (plural river dunes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "en",
          "name": "Landforms",
          "orig": "en:Landforms",
          "parents": [
            "Earth",
            "Places",
            "Nature",
            "Names",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Fundamental",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A dune formed from the sandy bed of a river"
      ],
      "id": "en-river_dune-en-noun-LcWIR1qt",
      "links": [
        [
          "dune",
          "dune"
        ],
        [
          "sandy",
          "sandy"
        ],
        [
          "bed",
          "bed"
        ],
        [
          "river",
          "river"
        ]
      ]
    }
  ],
  "word": "river dune"
}

{
  "forms": [
    {
      "form": "river dunes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "river dune (plural river dunes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Landforms"
      ],
      "glosses": [
        "A dune formed from the sandy bed of a river"
      ],
      "links": [
        [
          "dune",
          "dune"
        ],
        [
          "sandy",
          "sandy"
        ],
        [
          "bed",
          "bed"
        ],
        [
          "river",
          "river"
        ]
      ]
    }
  ],
  "word": "river dune"
}