The neutral PES features a reactant complex (RC), a submerged barrier serving as the TS, and a product complex (PC) well, as shown in Fig. . The hydrogen-bonded FNH3¯ anion geometry is similar to the TS. Together, this system presents as an ideal case for TS spectroscopy and is probed using slow photoelectron velocity-map imaging of cryogenically cooled anions (cryo-SEVI), which yields photoelectron spectra of complex species with kinetic-energy resolution as high as 1 cm -1 . The experiment is complemented by reduced-dimensional quantum dynamical calculations on the neutral PES. This combination of experiment and theory show that photodetachment from FNH3¯ directly accesses both sides of the TS barrier, revealing a large number of resonances, several of which may be relevant to the neutral reaction (dynamical resonances). In the product channel, we observe sharp structure corresponding to a manifold of vibrational Feshbach resonances supported by the post-TS well. In addition, complex and irregular features associated with the transition state and reactant well are observed, with some able to be assigned to resonances by comparison to theory. The results presented here thus represent the most complete mapping to date of the transition state region for a polyatomic reaction.