We report on the realization of a planar, quasiballistic Josephson junction array using a Au micron-sized single crystal. The system exhibits a nonlocal, multiterminal Josephson effect, where the supercurrent between any two superconducting leads is governed by the phase coherence across the entire crystal. Key evidence includes a nonmonotonic dependence of the critical current on junction length and magnetic interference patterns with periods corresponding to the shared normal-metal area. Nonlocal transport measurements further confirm that the supercurrent between two electrodes depends on the phase configuration of all the others. Our results, supported by a developed theoretical model, establish a platform for exploring complex superconducting phenomena in multiterminal ballistic systems.

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• Ballistic transport
• Critical current
• Josephson effect
• Mesoscopics
• Transport phenomena
• Josephson junctions
• Single crystal materials
• Superconducting devices
• Green's function methods
• Transport techniques