This question already has an answer here:

橋 reads as はし but 新橋 reads as しんばし

澤 as さわ and 金澤 as かなざわ etc.

any rules for how to pronounce?

marked as duplicate by Flaw, Earthliŋ, Blavius, user3856370, Eiríkr Útlendi Nov 15 '15 at 19:41

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Browse other questions tagged or ask your own question.