How about an umbrella liability policy? That would cover the land and anything else.
Be careful with ULPs covering vacant land. "Vacant land" in ULP terminology is often defined as "unimproved land" where unimproved may mean no sidewalks, no rough grading. no utilities stubbed, no tree removal, etc etc etc.
Best to seek an expert in the insurance field who deals speifically with this issue of insuring (un)improved properties.
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