Tyler owns a property within the city limits of a town that is on the mississippi river. who owns the land under this navigable river?

The state

Explanation:

Tyler holds a property inside the city furthest reaches of a town that is on the Mississippi River. According to the laws, the property is actually possessed by the state. Property owners possess the land under NON-traversable Rivers. Tyler can move around the property, and he can use it, but on papers, it is the property of the state, and Tyler cannot auction it or transfer it to anyone else.