Leonardo is right above and this time, Doc is also. Most home and farm liability policies will cover hunting lease exposures automatically, unless you have a permanent structure on it (for your use). The permanent structure issue applies whether it is made available to you by the land owner (a cabin or camp house lets say) or if it is your own. I was fortunate to find this jewel for $6,000 and it qualifies as a residence.
As such, the company who provides my insurance allows me to list this place as an additional residence which helps to set the issue straight. I don't have to pay for the acreage exposure, just the residence exposure, but it sure expands my coverage bunches. Not exactly sure, but betting most "city" companies won't do it.
If you own land and do not have a $1,000,000 farm liability policy or endorsement on your home insurance, then you are self insured. There are are many problems with this logic and most are extremely detrimental to your pocketbook. The $1,000,000 coverage amount is key because the State of Texas caps damages at $1,000,000 if you have a policy providing a $1,000,000 coverage limit. I believe it is from Chapter 75 of The Texas Civil Practices & Remedies Code, oftentimes referred to as the Recreational Land Use Act or something like that.
Btw, if you lease property for hunting rights, your home or farm coverage does not extend to the benefit of other members of the lease. Everyone needs their own unless you secure a separate policy listing all lease holders (read Leonardo's comments above).