In his Brihat Samhita, Varahamihira asserts that sweet ground water will be found near termite mounds located east of a jambu tree at a specific distance and a specific depth of 15 ft to the south of the tree.
The source of the relevant passage is ambiguous. Some point to the Brihat Samhita while others suggest that it can be found in the Vishnu Purana. However the latter uses a reference notation of Vr.S.54.9 which (could expand to verse, but) sounds like it points to the Vrihat (synonymous with Brihat) Samhita.
Connotations
Indian connection