/**** Start of imports. If edited, may not auto-convert in the playground. ****/
var groundwater = ee.FeatureCollection("projects/sat-io/open-datasets/global_water_salinity/groundwaters_database"),
    rivers = ee.FeatureCollection("projects/sat-io/open-datasets/global_water_salinity/rivers_database"),
    lakes_reservoir = ee.FeatureCollection("projects/sat-io/open-datasets/global_water_salinity/lakes_reservoirs_database");
/***** End of imports. If edited, may not auto-convert in the playground. *****/
print('Groundwater database size',groundwater.size())
print('Rivers database size',rivers.size())
print('Lakes database size',lakes_reservoir.size())

Map.addLayer(groundwater,{'color':'red','opacity':0.5},'Ground Database')
Map.addLayer(rivers,{'color':'blue','opacity':0.5},'Rivers Database')
Map.addLayer(lakes_reservoir,{'color':'brown','opacity':0.5},'Lakes and Reservoirs Database')