With an overall length of 20.90 m and a beam of 5.00 m, Rio Ésera is a Patrol Vessel designed and equipped for surveillance and fighting drug trafficking and illegal immigration, as well as protecting the marine environment, within the scope of the duties of the Spanish Civil Guard. Built for a service life of at least 15 years, the vessel can reach a speed of 36 knots thanks to its over 2,000 HP engines.