surfaceWaterBodyCategory specifies the administrative entity which best describes the item, hence it should be used as P31.
Note though that there is nothing preventing an item from being e.g. both a physical lake and a lake water body. This is however not guaranteed.
- Map surfaceWaterBodyCategory to Wikidata items - :d:User:AndreCostaWMSE-bot/WFD/surfaceWaterBodyCategory
- Investigate if there is a way of detecting when a swb only covers part of the physical body of water
- Implement in code