Ostende is a seaside resort on the Atlantic coast of Argentina belonging to the Pinamar Partido. The town limits to the north with the city of Pinamar, to the northeast with Mar de Ostende, to the south with Valeria del Mar, to the east with the Argentine Sea and to the west with General Madariaga Partido. Its landscape is characterized by wide beaches and large dunes full of leafy tamarisk trees.