The Suhu is a left tributary of the river Geru in Romania. It flows into the Geru near Piscu. The basin size of the 72 km (45 mi) long Suhu is 373 km2 (144 sq mi). It is also known as Suhurlui, but the Suhurlui is also a right tributary of the Suhu. Before the regularization of the lower course of the Siret, it was a tributary of the Bârlădel, a branch of the Siret. After the embankment of the Siret plain, the upper course of the Bârladel became the lower reach of the Geru.