The sources of the first - the Rioblanco, Pisco and Puntal - are to be found on the northern slopes of the transverse ridge which culminates in the Imbabura volcano.
Callao (q.v.) is a noteworthy exception, and Paita and Pisco are something more than the average coast village.
Paita, Eten, Pacasmayo, Salaverry, Callao, Pisco, Mollendo and Ilo, five of which are ports of call for foreign coasting steamers.
Coal has been found in extensive beds near Piura, Salaverry, Chimbote, Huarmey and Pisco on the coast, and at Goillarisquisga, Huarochiri and other places in the interior.
(4) The next coast-section extends for over 300 m., from Chancay to Nasca, and includes the rivers of Chancay or Lacha, of Carabayllo, Rimac, Lurin, Mala, Canete, Chincha, Pisco or Chunchanga, Ica and Rio Grande.