"sông Đông" meaning in Vietnamien

{
  "categories": [
    {
      "kind": "other",
      "name": "Cours d’eau en vietnamien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms propres en vietnamien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vietnamien",
      "orig": "vietnamien",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Vietnamien",
  "lang_code": "vi",
  "pos": "name",
  "pos_title": "Nom propre",
  "senses": [
    {
      "glosses": [
        "Don (fleuve russe)."
      ],
      "id": "fr-sông_Đông-vi-name-PLGJRnmH"
    }
  ],
  "word": "sông Đông"
}

{
  "categories": [
    "Cours d’eau en vietnamien",
    "Noms propres en vietnamien",
    "vietnamien"
  ],
  "lang": "Vietnamien",
  "lang_code": "vi",
  "pos": "name",
  "pos_title": "Nom propre",
  "senses": [
    {
      "glosses": [
        "Don (fleuve russe)."
      ]
    }
  ],
  "word": "sông Đông"
}