Pretty deep down the left field side but I would take these seats over the Terrace seats (upper deck) any day of the week. The worst part about these seats is the angle on the scoreboard. You have to constantly look left due to it's positioning and I hated that.
To give you an idea what the view of the field is like from section 139, here is a Youtube video shot from there during a Phillies game at Citizens Bank Park.
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