National Geographic Expeditions and G Adventures are expanding a range of small-group tours further into South America and Europe.

New trips cover Bolivia, northern Peru, Portugal, Spain, Hungary and Romania.

The additions come in the fourth year of a partnership to create National Geographic Journeys tours, which have grown from 70 tours in its initial year to 89 different tours in 55 countries today.

A special focus on expanding tours further into Africa and Asia since last autumn helped bring new travellers to Tanzania, Botswana, Mongolia and Indonesia.

G Adventures has seen a 30% year-on-year increase in British travellers taking the tours with Costa Rica, Peru, India, South Africa and Vietnam the most popular destinations.

G Adventures managing director Brian Young said: “Since its launch in 2015, the National Geographic Journeys with G Adventures portfolio has seen incredible growth, with our travellers being drawn to their unique, off-the-beaten-path itineraries and exclusive experiences.

“These new tours will offer our Journeys travellers the opportunity to explore new, untouched destinations and will allow us to keep up with traveller demand.

“These tours are proving to be one of the most attractive and sellable experiences we offer, and we are seeing an impressive 70% of our Journeys travellers coming through our partner travel agents.”

National Geographic Expeditions senior vice president Heather Heverling added: “We are thrilled with the strong growth of the Journeys line and are pleased to expand our offerings allowing consumers to experience different parts of the globe.

“It feels good to be able to offer people even more ways to connect with the inspiring community programmes and fieldwork each of our organisations support.”