Currently, the map art for the borders (along with other "lakes" that are just puddles of mud animals can drink from for no reason) are inaccurate compared to the in-game shorelines of the river. This is seen most prominently along the bottom right section, with the visual map showing water along the entire bottom edge of the map. In reality, this area only has patchy spots of water that are outside of the map borders - animals are meant to be able to drink here but never do because of this. It varies from slightly inaccurate to completely incorrect. The sandy shores go out a lot further than the map suggests, making it difficult or nigh impossible to retrieve corpses that are drinking at the waterline.
Additionally, there is a portion of land below Xigalo Lookout and the outpost Nambu Tlhelo and above the Henhla Ndhawu outpost that displays as dry land on the map. In-game, this area is dry land, but contains mud that animals are able to drink from, creating confusion - no other maps have such a feature that I am aware of (though there are maps that have lakes that are not displayed on the visual map). There are small areas throughout the map that do this but none as prominent as this area.
My suggestion to fix this is to either (preferably both):
1 - Push out the border of the map further to allow for proper hunting along the shorelines for Cape Buffalo, Warthog, Lesser Kudu and Eurasian Wigeon;
OR
2 - Align the waterlines on the visual map to the in-game map / align the waterlines on the in-game map to the visual map.
As for the unmarked mud water source - update the visual map to have a marsh/swampland indicator by putting a visual for shallow water there.