  We investigate the electronic properties of ballistic planar Josephson
junctions with multiple superconducting terminals. Our devices consist of
monolayer graphene encapsulated in boron nitride with molybdenum-rhenium
contacts. Resistance measurements yield multiple resonant features, which are
attributed to supercurrent flow among adjacent and non-adjacent Josephson
junctions. In particular, we find that superconducting and dissipative currents
coexist within the same region of graphene. We show that the presence of
dissipative currents primarily results in electron heating and estimate the
associated temperature rise. We find that the electrons in encapsulated
graphene are efficiently cooled through the electron-phonon coupling.
