Between the head of the engine and the intake manifold
There is also a gasket between the manifold and the thermostat cover. That could be leaking and then running over to where the TB is.
There are like a dozen or so gaskets, fasteners, or pipes on that part of the engine that could leak coolant. I'd say let it dry out good and then run it up to temp. and then looks with a flashlight and dab at it with a paper towel to try to find the origin of the leak.
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