Fighting took place primarily along the frontiers between New France and the British colonies, from Virginia in the south to Newfoundland in the north. It began with a dispute over control of the confluence of the Allegheny and Monongahela rivers called the Forks of the Ohio, and the site of the French Fort Duquesne within present-day Pittsburgh, Pennsylvania. The dispute erupted into violence in the Battle of Jumonville Glen in May 1754, during which Virginia militiamen under the command of 22-year-old George Washington ambushed a French patrol.

Based on this passage, the french and indian war was fought over disputed land. what was the land? Let's give stream of consciousness first:
The relevant information to answer the above question is: It began with a dispute over control of the confluence of the Allegheny and Monongahela rivers called the Forks of the Ohio, and the site of the French Fort Duquesne within present-day Pittsburgh, Pennsylvania.
So, the final answer is the confluence of the Allegheny and Monongahela rivers called the Forks of the Ohio , and the site of the French Fort Duquesne within present - day Pittsburgh , Pennsylvania.