I see you have received some answer already. First of all I want to inform you that I have merged your posts with the same content. If you need to change your original post, it is not necessary to post it again. You can simply make an edit. Press the three blue dots on your post then click on “edit” . Edit your post - Why and How To will guide you
Regarding you questions, as you have already seen, we cannot add borders or boundaries or polygons in Maps. We can only define where the business is (the center of the business).
Real estate lands are not elegible to be in Google maps (they are a product, not a business)
If the Farm is a business, the farm itself can be in maps, with a pin (not with an area), but not a field itself
Lakes and rivers are elements of the Map Layer. Local Guides cannot edit that layer. Only Google Maps team can.
What we can do, for helping the team, is to report an error on Google Maps, through the “send a feedback” that you will find scrolling down your menu on Google Maps, or contacting the Google Maps Help Community
For Agricultural lands the answer is exactly the same of Paddy fields: If the Farm is a business, the farm itself can be in maps, with a pin (not with an area), but not a land itself
In addition, for your own privacy, please edit your post to remove your email address. As you see, we respond publicly here, we will never use your email address