Note 70 — Chapter III · {XI}[48] Red River—Exploring Expedition of 1806—Return to the Arkansa—Earthquakes

Rio Rojo (Red River) was the Spanish name for the upper Canadian—the portion marked Rio Mora on the map—but Long's party struck the Canadian considerably to the east of this portion (see preceding volume, note 71). However, the same name was commonly given to other streams. Humboldt's conjecture was that the Pecos (which had not been explored to its mouth) was the upper course of Red River of Natchitoches. See Political Essay on the Kingdom of New Spain (London, 1811), ii, p. 313. The head-waters of the Pecos lie between the upper Canadian and Santa Fé.—Ed.