日本の河川 - JSON

[
  {
    "code": "01",
    "slug": "shinano-river",
    "name": "信濃川",
    "description": "日本一長い河川で、長野県から新潟県を流れ日本海に注ぎます。",
    "lengthKm": 367,
    "basinAreaKm2": 11900,
    "source": "甲武信ヶ岳（長野県）",
    "mouth": "日本海（新潟市）",
    "prefectures": [
      "長野県",
      "新潟県"
    ],
    "riverClass": "一級河川",
    "ranking": 1
  },
  {
    "code": "02",
    "slug": "tone-river",
    "name": "利根川",
    "description": "流域面積日本一の河川で、関東平野を流れ太平洋に注ぎます。",
    "lengthKm": 322,
    "basinAreaKm2": 16840,
    "source": "大水上山（群馬県）",
    "mouth": "太平洋（銚子市）",
    "prefectures": [
      "群馬県",
      "栃木県",
      "埼玉県",
      "茨城県",
      "千葉県",
      "東京都"
    ],
    "riverClass": "一級河川",
    "ranking": 2
  },
  {
    "code": "03",
    "slug": "ishikari-river",
    "name": "石狩川",
    "description": "北海道最長の河川で、鮭漁で有名な河川です。",
    "lengthKm": 268,
    "basinAreaKm2": 14330,
    "source": "石狩岳（北海道）",
    "mouth": "日本海（石狩市）",
    "prefectures": [
      "北海道"
    ],
    "riverClass": "一級河川",
    "ranking": 3
  },
  {
    "code": "04",
    "slug": "teshio-river",
    "name": "天塩川",
    "description": "北海道2番目に長い河川で、カヌーの名所として知られています。",
    "lengthKm": 256,
    "basinAreaKm2": 5590,
    "source": "天塩岳（北海道）",
    "mouth": "日本海（天塩町）",
    "prefectures": [
      "北海道"
    ],
    "riverClass": "一級河川",
    "ranking": 4
  },
  {
    "code": "05",
    "slug": "kitakami-river",
    "name": "北上川",
    "description": "東北を代表する河川で、北上展勝地の桜並木が有名です。",
    "lengthKm": 249,
    "basinAreaKm2": 10150,
    "source": "弓弭の泉（岩手県）",
    "mouth": "太平洋（石巻市）",
    "prefectures": [
      "岩手県",
      "宮城県"
    ],
    "riverClass": "一級河川",
    "ranking": 5
  },
  {
    "code": "06",
    "slug": "abukuma-river",
    "name": "阿武隈川",
    "description": "福島県と宮城県を流れる河川で、阿武隈ライン舟下りなど観光名所があります。",
    "lengthKm": 239,
    "basinAreaKm2": 5400,
    "source": "旭岳（福島県）",
    "mouth": "太平洋（仙台平野）",
    "prefectures": [
      "福島県",
      "宮城県"
    ],
    "riverClass": "一級河川",
    "ranking": 6
  },
  {
    "code": "07",
    "slug": "mogami-river",
    "name": "最上川",
    "description": "山形県を流れる急流で、松尾芭蕉の俳句で知られる河川です。",
    "lengthKm": 229,
    "basinAreaKm2": 7040,
    "source": "吾妻山（山形県）",
    "mouth": "日本海（酒田市）",
    "prefectures": [
      "山形県"
    ],
    "riverClass": "一級河川",
    "ranking": 7
  },
  {
    "code": "08",
    "slug": "kiso-river",
    "name": "木曽川",
    "description": "長野県から三重県を流れ伊勢湾に注ぐ河川です。",
    "lengthKm": 229,
    "basinAreaKm2": 9100,
    "source": "鉢盛山（長野県）",
    "mouth": "伊勢湾",
    "prefectures": [
      "長野県",
      "岐阜県",
      "愛知県",
      "三重県"
    ],
    "riverClass": "一級河川",
    "ranking": 7
  },
  {
    "code": "09",
    "slug": "tenryu-river",
    "name": "天竜川",
    "description": "長野県、愛知県、静岡県を流れ遠州灘に注ぐ河川です。",
    "lengthKm": 213,
    "basinAreaKm2": 5050,
    "source": "諏訪湖（長野県）",
    "mouth": "太平洋（遠州灘）",
    "prefectures": [
      "長野県",
      "愛知県",
      "静岡県"
    ],
    "riverClass": "一級河川",
    "ranking": 9
  },
  {
    "code": "10",
    "slug": "aganogawa-river",
    "name": "阿賀野川",
    "description": "福島県と新潟県を流れ、深い山を縫うように流れる河川です。",
    "lengthKm": 210,
    "basinAreaKm2": 7710,
    "source": "荒海山（福島県）",
    "mouth": "日本海（新潟市）",
    "prefectures": [
      "福島県",
      "新潟県"
    ],
    "riverClass": "一級河川",
    "ranking": 10
  },
  {
    "code": "15",
    "slug": "fuji-river",
    "name": "富士川",
    "description": "日本三大急流の一つで、静岡県を流れる河川です。",
    "lengthKm": 128,
    "basinAreaKm2": 3990,
    "source": "鋸岳（山梨県）",
    "mouth": "駿河湾",
    "prefectures": [
      "長野県",
      "山梨県",
      "静岡県"
    ],
    "riverClass": "一級河川",
    "ranking": 15
  },
  {
    "code": "B7",
    "slug": "yodo-river",
    "name": "淀川",
    "description": "近畿圏の中心を流れる河川で、流域人口は西日本最大です。",
    "lengthKm": 75,
    "basinAreaKm2": 8240,
    "source": "琵琶湖（滋賀県）",
    "mouth": "大阪湾",
    "prefectures": [
      "滋賀県",
      "京都府",
      "大阪府",
      "兵庫県",
      "奈良県",
      "三重県"
    ],
    "riverClass": "一級河川",
    "ranking": null
  }
]