Transpontine is an adjective that describes something that is on the other side of a bridge or river, or refers to the south side of the River Thames in London. Synonyms for this term include "transriver," "cross-river," "southern," and "over the bridge." These words can be used interchangeably with "transpontine" to describe something located across a river or bridge. Another synonym for transpontine that can be used to describe the southern part of London is "southernmost." In essence, these terms serve as a way to geographically locate a place or object that is situated across a body of water, particularly a river.