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HESS J1843$-$033 is a very-high-energy gamma-ray source whose origin remainsunidentified. This work presents, for the first time, the energy spectrum ofgamma rays beyond $100\, {\rm TeV}$ from the HESS J1843$-$033 region using thedata recorded by the Tibet air shower array and its underground muon detectorarray. A gamma-ray source with an extension of $0.34^{\circ} \pm 0.12^{\circ}$is successfully detected above $25\, {\rm TeV}$ at $(\alpha,\, \delta) =(281.09^{\circ}\pm 0.10^{\circ},\, -3.76^{\circ}\pm 0.09^{\circ})$ near HESSJ1843$-$033 with a statistical significance of $6.2\, \sigma$, and the sourceis named TASG J1844$-$038. The position of TASG J1844$-$038 is consistent withthose of HESS J1843$-$033, eHWC J1842$-$035, and LHAASO J1843$-$0338. Themeasured gamma-ray energy spectrum in $25\, {\rm TeV} < E < 130\, {\rm TeV}$ isdescribed with ${\rm d}N/{\rm d}E = (9.70\pm 1.89)\times 10^{-16} (E/40\, {\rmTeV})^{-3.26\pm 0.30}\, {\rm TeV}^{-1} {\rm cm}^{-2} {\rm s}^{-1}$, and thespectral fit to the combined spectra of HESS J1843$-$033, LHAASO J1843$-$0338,and TASG J1844$-$038 implies the existence of a cutoff at $49.5\pm 9.0\, {\rmTeV}$. Associations of TASG J1844-038 with SNR G28.6$-$0.1 and PSR J1844-0346are also discussed in detail for the first time.

Measurement of the Gamma-Ray Energy Spectrum beyond 100 TeV from the HESS J1843$-$033 Region