This study reports the first experimental realization of two-dimensional (2D) boron sheets on an Ag(111) surface. Two distinct boron sheet structures, labeled S1 and S2, were identified. S1 corresponds to a triangular boron lattice with hexagonal holes, while S2 is a zig-zag boron structure. Both structures are relatively stable against oxidation and interact weakly with the Ag(111) substrate. The S1 phase is consistent with the $ {}^{2}_{12} $-sheet model, while S2 matches the $ \zeta_{3} $-sheet model. These structures were confirmed through first-principles calculations and scanning tunneling microscopy (STM) imaging. The $ {}^{2}_{12} $-sheet model has a rectangular unit cell with lattice constants of 3.0 Å and 5.0 Å, while the $ \zeta_{3} $-sheet model has a zig-zag boron row structure. The S1 and S2 phases were found to have similar boron densities, around 33.6 nm⁻² and 31.3 nm⁻², respectively. The 2D boron sheets exhibit metallic properties, as confirmed by scanning tunneling spectroscopy (STS) and band structure calculations. The sheets are chemically stable and resistant to oxidation, making them promising for future electronic applications. The weak interaction between the boron sheets and the Ag(111) substrate suggests that these sheets could potentially be separated from the substrate, similar to graphene. The results demonstrate that 2D boron sheets can be synthesized on various substrates, including Ag(111), Au(111), and Cu(111), and that different substrate interactions may lead to different 2D boron structures. The unique physical and chemical properties of 2D boron sheets, such as massless Dirac fermions and novel reconstruction geometries, may be explored in future studies. The study provides a foundation for the development of boron-based microelectronic devices and highlights the potential of 2D boron sheets in future electronic applications.This study reports the first experimental realization of two-dimensional (2D) boron sheets on an Ag(111) surface. Two distinct boron sheet structures, labeled S1 and S2, were identified. S1 corresponds to a triangular boron lattice with hexagonal holes, while S2 is a zig-zag boron structure. Both structures are relatively stable against oxidation and interact weakly with the Ag(111) substrate. The S1 phase is consistent with the $ {}^{2}_{12} $-sheet model, while S2 matches the $ \zeta_{3} $-sheet model. These structures were confirmed through first-principles calculations and scanning tunneling microscopy (STM) imaging. The $ {}^{2}_{12} $-sheet model has a rectangular unit cell with lattice constants of 3.0 Å and 5.0 Å, while the $ \zeta_{3} $-sheet model has a zig-zag boron row structure. The S1 and S2 phases were found to have similar boron densities, around 33.6 nm⁻² and 31.3 nm⁻², respectively. The 2D boron sheets exhibit metallic properties, as confirmed by scanning tunneling spectroscopy (STS) and band structure calculations. The sheets are chemically stable and resistant to oxidation, making them promising for future electronic applications. The weak interaction between the boron sheets and the Ag(111) substrate suggests that these sheets could potentially be separated from the substrate, similar to graphene. The results demonstrate that 2D boron sheets can be synthesized on various substrates, including Ag(111), Au(111), and Cu(111), and that different substrate interactions may lead to different 2D boron structures. The unique physical and chemical properties of 2D boron sheets, such as massless Dirac fermions and novel reconstruction geometries, may be explored in future studies. The study provides a foundation for the development of boron-based microelectronic devices and highlights the potential of 2D boron sheets in future electronic applications.