A review of future very large neutrino detectors for the measurement of neutrino oscillation pa-
rameters is presented. Three main options are compared: the water cherenkov technology, as in
Hyper-Kamiokande, the liquid argon technology, as in DUNE, and the liquid scintillator technol-
ogy, as in JUNO. The prospects, the advantages and the weaknesses of each technology will be
addressed.