Two places ,
In the inside bend north of that narrows, or toward the end of that narrow section.
Reason I'd choose those locations is both make good locations to have a tighter muti row planting of the trees. This in turn will give better pollination & higher nut production for you.
Back when chestnuts were common trees in the east no one much hunted in oak groves. They hunted chestnut groves as they had many more deer in them. Once those trees reach a size to produce nuts in any numbers anyone hunting that property is going to want to hunt that Chestnut grove above all others.
Good luck with your planting! I've a few chestnut trees, though I need to plant more to have a good stand of them. All in good time I guess.......