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Table 2 Distribution of snail area burden (hm2) by environmental location in seven provinces in China, 2009–2017

From: Change patterns of oncomelanid snail burden in areas within the Yangtze River drainage after the three gorges dam operated

Year Total snail area Marshlands and lakes Plain regions Hilly and mountainous regions
Inner embankment Outside embankment
  No. No. % No. % No. % No. %
2009 372 253 21 100 5.67 336 764 90.47 202 0.05 14 187 3.81
2010 373 516 21 138 5.66 337 679 90.41 195 0.05 14 504 3.88
2011 372 595 20 734 5.56 338 399 90.82 176 0.05 13 286 3.57
2012 368 633 20 382 5.53 335 507 91.01 209 0.06 12 535 3.40
2013 365 366 20 090 5.50 332 537 91.01 203 0.06 12 536 3.45
2014 364 245 22 345 6.13 329 658 90.50 145 0.04 12 096 3.32
2015 356 212 20 799 5.84 323 277 90.75 111 0.03 12 025 3.38
2016 356 752 21 291 5.97 317 884 89.11 133 0.04 17 444 4.89
2017 356 553 21 285 5.97 323 053 90.60 106 0.03 12 109 3.40