In the Euskara language there are several dialects, arrasti on, belongs to the Bizkaian dialect so it is correct. Arratasalde on is said in the "batua" to be a modern Basque in which they tried to unite the dialects. Both are correct.
This website uses your own and third party cookies to optimize your navigation, adapt to your preferences and perform analytical work. As we continue to navigate, we understand that you accept ourCookies PoliciesAccept