[out:xml][timeout:99999][maxsize:2073741824];
(
  way["natural"="water"](50.5,112.8,78,148.8);
  relation["natural"="water"](50.5,112.8,78,148.8);
  way["waterway"="riverbank"](50.5,112.8,78,148.8);
  relation["waterway"="riverbank"](50.5,112.8,78,148.8);
);
(._;>;);
out body;