The Northern Coast is in Peru. The bordercrossing at the coast with Ecuador is near the bordertown of Aguas Verdes and Huayaquillas. There are several international busses which make the crossing and wait at the immigration office.
Piura is the capital city of the region of Piura in northern Peru. It´s a bit bustly and not overly beautiful, yet still has an attractive air, and is a great place to gobble down some tasty Peruvian cuisine.