In Northern Bizkaian Basque (NBB), Intermediate Phrases (ips) align by default with the left edge of syntactic phrases. The main intonational cue of ips is partial pitch reset at their left edges. A minimal size constraint applies on ips occurring at the left edge of an Intonational Phrase (IP), requiring that they consist of at least two Accentual Phrases (APs). Following [9]’s idea that certain prominent positions demand augmentation, the NBB facts show that the left edge of an IP can also be a phonologically prominent position.