The discoveries were made near Lake Turkana, the world's largest permanent desert lake and largest alkaline lake. The region has produced a string of ancient paleontological finds connected to humans' earliest days millions of years ago.
The underground lakes were discovered by Radar Technologies International, which said its survey found that the two confirmed Turkana aquifers hold a minimum of 250 billion cubic meters of water, finds it said could boost Kenya's share of available water by 17 percent.
RTI said the three other unconfirmed aquifers could hold another 30 billion cubic meters of water. Drilling will confirm the existence of those three masses of water.
"This groundwater raises the prospect for improving the livelihoods of the Turkana people, most of whom live in poverty and have limited access to basic services and clean water," said RTI, which detects water using satellite data, oil exploration technologies and conventional hydrogeological techniques.
The finding demonstrates how "science and technology can contribute to industrialization and economic growth, and to resolving real societal issues like access to water," said Gretchen Kalonji, UNESCO's assistant director-general for natural sciences.