1. As "tech-ee": This pronunciation is common when referring to the Atchafalaya Basin in Louisiana, specifically the Atchafalaya River, where the word "Teche" is used to refer to the lower Atchafalaya River.
2. As "tek-ee": This pronunciation is less common but can be used when referring to the Teche River, which is a different river entirely from the Atchafalaya River. However, this pronunciation is not widely accepted.
Therefore, it's best to use the pronunciation "tech-ee" unless you are specifically referring to the Teche River.