The phrase "mar que banha o Azerbaijão" translates to "sea that bathes Azerbaijan" or more naturally, "sea that borders Azerbaijan." The sea referred to here is the Caspian Sea, which borders Azerbaijan to the east.

• "mar" means [mar](javascript:void(0)) (sea)
• "que" means [que](javascript:void(0)) (that/which)
• "banha" means [banha](javascript:void(0)) (bathes or borders in this context)
• "o" means [o](javascript:void(0)) (the)
• "Azerbaijão" means [Azerbaijão](javascript:void(0)) (Azerbaijan)

So, "mar que banha o Azerbaijão" refers to the Caspian Sea bordering or bathing Azerbaijan.