Tidal patterns along India's coasts differ between the west and east coasts due to differences in basin geometry, resonance characteristics, and the relative dominance of semi-diurnal versus diurnal tidal constituents: the west coast (Arabian Sea side) predominantly experiences a regular semi-diurnal tide (two nearly equal high and low tides per day), while the east coast (Bay of Bengal side) experiences a mixed, predominantly semi-diurnal tide pattern with greater inequality between successive high and low tides due to the more complex resonance and shallower, funnel-shaped bathymetry of the Bay of Bengal.