Ivanhoe by Walter Scott tackles a lot the issue of land ownership. The Normands invaded England in 1066. William the Conqueror made the royal forest to protect any creature there. The royal forest was over one third of England. People were moved and no one had the right to hunt on the royal grounds. There was even projects to extend the forest by limiting wood exploitation.
In "Three Men in a Bummel" by Jerome Kaplka Jerome, it is briefly discussed the ownership of rivers. Rivers are in theory public but you can own the land around it. You can't do fishing, throw rocks or just observe the river because it is all private propriety.
In some medieval villages, lands were shared in common without any owner or lord to pay taxes. In some modern cities, you have common gardens.
Discuss land ownership.
There is also issue of rivers exploitation if goes through different countries like pollution or inundation through hydroelectric stations.