In the center of the Park, the Martín River flows through the Calcareous massif of Las Muelas -between the municipalities of Obón and Torre de las Arcas-, the Benicozar and Guardías mountains -in Alcaine-, and the Los Moros and Sancho Abarca mountain ranges -between the latter town and Oliete-, which are crossed by two of its main tributaries, the Radón River and the Seco River. In the depression that originates in these mountains (Foz del Río Martín) and between the towns of Alcaine and Oliete, the Cueva Foradada reservoir was built, which, while regulating the waters of the Martín for the irrigation of the fertile valley it originates, provides its waters with a rest in their busy meandering.
To the north it is the Arcos mountain range that hindered its flow on its way to its mouth in the Ebro. In its foothills, the Muela and Mortero ravines -which originate in Alacón- and the Escuriza river -at the height of Ariño-, join their waters to the Martín to open a deep breach in the mountain range known as Los Estrechos, shortly before reaching Albalate del Arzobispo, the northeastern limit of the Martín River Cultural Park.
