Treasure map

Where is the treasure? in the MIDDLE

Today in maths we did a problem. I remember drawing it with 5 squares each way,'' says the Captain. 

"There was a row of three trees running due East from the square (1,1)", Peg Leg Pete says. "You put each one of them on a different square."

"Weren’t there four granite boulders going due South from (5,5)?" John asks. "I think you put one of them each in a square too."

"Ah!. Now I remember!" yells the Captain. "I buried the treasure halfway between the first
rock and the most western tree!"