Asopus (/əˈsoʊpəs/; Ancient Greek: Ἀσωπός Asôpos) is the name of four different rivers in Greece and one in Turkey. In Greek mythology, it was also the name of the gods of those rivers.
As mythological entities, the Boeotian river Asopus and the Phliasian river Asopus are much confounded. They are duplicated a second time as supposed mortal kings who gave their names to the corresponding rivers. Indeed, logically, since the children fathered by gods on various daughters of either Boeotian or Phliasian Asopus were mortal in these tales, then the daughters themselves must have been mortal, and therefore either the mother of these daughters (often given as Metope daughter of river Ladon) or their father Asopus must have been mortal, or both of them.
The Bibliotheca (3.12.6) of Pseudo-Apollodorus informs that the river Asopus was a son of Oceanus and Tethys or, according to Acusilaus, of Poseidon by Pero (otherwise unknown to us), or according to yet others of Zeus by Eurynome; it is uncertain whether he knows there is more than one river named Asopus.
Pausanias (1.12.4) writes that during the reign of Aras, the first earth-born king of Sicyonian land, Asopus, said to be son of Poseidon by Celusa (this Celusa otherwise unknown but possibly identical to Pero mentioned above), discovered for him the river called Asopus and gave it his name. Diodorus Siculus (4,72) similarly presents Asopus (here son of Oceanus and Tethys) as a settler in Phlius and wife of Metope daughter of Ladon, presumably here and elsewhere the Arcadian river Ladon.