El río Ulldemó desde su nacimiento hasta su desembocadura en el río Matarraña es un ejemplo representativo de los ríos de montaña mediterránea calcárea. El régimen hidrológico es pluvial mediterráneo y con una fuerte estacionalidad.
El río ha excavado su curso en el fondo de un valle confinado, modelado sobre calizas. El trazado en planta es sinuoso, sinuosidad siempre ligada al relieve. Presenta un lecho mixto en el que es común que aflore el zócalo rocoso o que aparezca cubierto por gravas, cantos o arenas.
La mimbrera calcófila mediterránea es la formación riparia representada, y muestra un alto grado de naturalidad a pesar de la presencia puntual de la caña (Arundo donax) especie que debido a su gran capacidad adaptativa ha llegado a expandirse y dominar algunos ecosistemas riparios.
El sistema fluvial experimenta alguna alteración puntual que no modifica sus características naturales que se mantienen prácticamente inalteradas.
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